9 letter word starting with ac

Words Parts of Speech Meaning/Definition/Similar Words
academial adjective Academic.
academian noun A member of an academy, university, or college.
academism noun The doctrines of the Academic philosophy.
academist noun An Academic philosopher., An academician.
academies plural of Academy
acalephan noun One of the Acalephae.
acalephae noun pl. A group of Coelenterata, including the Medusae or jellyfishes, and hydroids; — so called from the stinging power they possess. Sometimes called sea nettles.
acalycine adjective Alt. of Acalysinous
acanthine adjective Of, pertaining to, or resembling, the plant acanthus.
acapsular adjective Having no capsule.
accedence noun The act of acceding.
accension noun The act of kindling or the state of being kindled; ignition.
accenting present participle & vb. noun of Accent
accentual adjective Of or pertaining to accent; characterized or formed by accent.
accepting present participle & vb. noun of Accept
acceptant adjective Accepting; receiving., An accepter.
acception noun Acceptation; the received meaning.
acceptive adjective Fit for acceptance., Ready to accept.
accessary adjective Accompanying, as a subordinate; additional; accessory; esp., uniting in, or contributing to, a crime, but not as chief actor. See Accessory., One who, not being present, contributes as an assistant or instigator to the commission of an offense.
accession noun A coming to; the act of acceding and becoming joined; as, a king’s accession to a confederacy., Increase by something added; that which is added; augmentation from without; as, an accession of wealth or territory., A mode of acquiring property, by which the owner of a corporeal substance which receives an addition by growth, or by labor, has a right to the part or thing added, or the improvement (provided the thing is not changed into a different species). Thus, the owner of a cow becomes the owner of her calf., The act by which one power becomes party to engagements already in force between other powers., The act of coming to or reaching a throne, an office, or dignity; as, the accession of the house of Stuart; — applied especially to the epoch of a new dynasty., The invasion, approach, or commencement of a disease; a fit or paroxysm.
accessive adjective Additional.
accessory adjective Accompanying as a subordinate; aiding in a secondary way; additional; connected as an incident or subordinate to a principal; contributing or contributory; said of persons and things, and, when of persons, usually in a bad sense; as, he was accessory to the riot; accessory sounds in music., That which belongs to something else deemed the principal; something additional and subordinate., Same as Accessary, n., Anything that enters into a work of art without being indispensably necessary, as mere ornamental parts.
accidence noun The accidents, of inflections of words; the rudiments of grammar., The rudiments of any subject.
accipient noun A receiver.
accipiter noun A genus of rapacious birds; one of the Accipitres or Raptores., A bandage applied over the nose, resembling the claw of a hawk.
acclaimer noun One who acclaims.
acclimate verb t. To habituate to a climate not native; to acclimatize.
acclivity noun A slope or inclination of the earth, as the side of a hill, considered as ascending, in opposition to declivity, or descending; an upward slope; ascent.
acclivous adjective Sloping upward; rising as a hillside; — opposed to declivous.
accompany verb t. To go with or attend as a companion or associate; to keep company with; to go along with; — followed by with or by; as, he accompanied his speech with a bow., To cohabit with., To associate in a company; to keep company., To cohabit (with)., To perform an accompanying part or parts in a composition.
according present participle & vb. noun of Accord, Agreeing; in agreement or harmony; harmonious., Accordingly; correspondingly.
accordant adjective Agreeing; consonant; harmonious; corresponding; conformable; — followed by with or to.
accordion noun A small, portable, keyed wind instrument, whose tones are generated by play of the wind upon free metallic reeds.
accosting present participle & vb. noun of Accost
accounted imp. & past participle of Account
accourage verb t. To encourage.
accoutred of Accoutre
accretion noun The act of increasing by natural growth; esp. the increase of organic bodies by the internal accession of parts; organic growth., The act of increasing, or the matter added, by an accession of parts externally; an extraneous addition; as, an accretion of earth., Concretion; coherence of separate particles; as, the accretion of particles so as to form a solid mass., A growing together of parts naturally separate, as of the fingers toes., The adhering of property to something else, by which the owner of one thing becomes possessed of a right to another; generally, gain of land by the washing up of sand or sail from the sea or a river, or by a gradual recession of the water from the usual watermark., Gain to an heir or legatee, failure of a coheir to the same succession, or a co-legatee of the same thing, to take his share.
accretive adjective Relating to accretion; increasing, or adding to, by growth.
accrument noun The process of accruing, or that which has accrued; increase.
accumbent adjective Leaning or reclining, as the ancients did at their meals., Lying against anything, as one part of a leaf against another leaf., One who reclines at table.
accusable adjective Liable to be accused or censured; chargeable with a crime or fault; blamable; — with of.
acephalan noun Same as Acephal., Belonging to the Acephala.
acescence noun Alt. of Acescency
acescency noun The quality of being acescent; the process of acetous fermentation; a moderate degree of sourness.
acetamide noun A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl.
acetifier noun An apparatus for hastening acetification.
acetified imp. & past participle of Acetify
acetosity noun The quality of being acetous; sourness.
acetylene noun A gaseous compound of carbon and hydrogen, in the proportion of two atoms of the former to two of the latter. It is a colorless gas, with a peculiar, unpleasant odor, and is produced for use as an illuminating gas in a number of ways, but chiefly by the action of water on calcium carbide. Its light is very brilliant.
achieving present participle & vb. noun of Achieve
achillean adjective Resembling Achilles, the hero of the Iliad; invincible.
aciculate adjective Alt. of Aciculated
aciculite noun Needle ore.
acidifier noun A simple or compound principle, whose presence is necessary to produce acidity, as oxygen, chlorine, bromine, iodine, etc.
acidified imp. & past participle of Acidify
acidulate verb t. To make sour or acid in a moderate degree; to sour somewhat.
acidulent adjective Having an acid quality; sour; acidulous.
acidulous adjective Slightly sour; sub-acid; sourish; as, an acidulous tincture.
aciniform adjective Having the form of a cluster of grapes; clustered like grapes., Full of small kernels like a grape.
acipenser noun A genus of ganoid fishes, including the sturgeons, having the body armed with bony scales, and the mouth on the under side of the head. See Sturgeon.
acockbill adverb Hanging at the cathead, ready to let go, as an anchor., Topped up; having one yardarm higher than the other.
aconitine noun An intensely poisonous alkaloid, extracted from aconite.
acorn cup The involucre or cup in which the acorn is fixed.
acoumeter noun An instrument for measuring the acuteness of the sense of hearing.
acoumetry noun The measuring of the power or extent of hearing.
acoustics noun The science of sounds, teaching their nature, phenomena, and laws.
acquiesce verb i. To rest satisfied, or apparently satisfied, or to rest without opposition and discontent (usually implying previous opposition or discontent); to accept or consent by silence or by omitting to object; — followed by in, formerly also by with and to., To concur upon conviction; as, to acquiesce in an opinion; to assent to; usually, to concur, not heartily but so far as to forbear opposition.
acquiring present participle & vb. noun of Acquire
acquisite adjective Acquired.
acquitted imp. & past participle of Acquit
acquittal noun The act of acquitting; discharge from debt or obligation; acquittance., A setting free, or deliverance from the charge of an offense, by verdict of a jury or sentence of a court.
acquitter noun One who acquits or releases.
acraspeda noun pl. A group of acalephs, including most of the larger jellyfishes; the Discophora.
acridness noun The quality of being acrid or pungent; irritant bitterness; acrimony; as, the acridity of a plant, of a speech.
acritical adjective Having no crisis; giving no indications of a crisis; as, acritical symptoms, an acritical abscess.
acrobatic adjective Pertaining to an acrobat.
acropetal adjective Developing from below towards the apex, or from the circumference towards the center; centripetal; — said of certain inflorescence.
acrophony noun The use of a picture symbol of an object to represent phonetically the initial sound of the name of the object.
acropolis noun The upper part, or the citadel, of a Grecian city; especially, the citadel of Athens.
acrospire noun The sprout at the end of a seed when it begins to germinate; the plumule in germination; — so called from its spiral form., To put forth the first sprout.
acrospore noun A spore borne at the extremity of the cells of fructification in fungi.
acroteria plural of Acroterium
actinaria noun pl. A large division of Anthozoa, including those which have simple tentacles and do not form stony corals. Sometimes, in a wider sense, applied to all the Anthozoa, expert the Alcyonaria, whether forming corals or not.
actinozoa noun pl. A group of Coelenterata, comprising the Anthozoa and Ctenophora. The sea anemone, or actinia, is a familiar example.
actionary noun Alt. of Actionist
actionist noun A shareholder in joint-stock company.
actualist noun One who deals with or considers actually existing facts and conditions, rather than fancies or theories; — opposed to idealist.
actuality noun The state of being actual; reality; as, the actuality of God’s nature.
actualize verb t. To make actual; to realize in action.
actuarial adjective Of or pertaining to actuaries; as, the actuarial value of an annuity.
actuaries plural of Actuary
actuating present participle & vb. noun of Actuate
actuation noun A bringing into action; movement.
actuosity noun Abundant activity.
aculeated adjective Having a sharp point; armed with prickles; prickly; aculeate.
acuminate adjective Tapering to a point; pointed; as, acuminate leaves, teeth, etc., To render sharp or keen., To end in, or come to, a sharp point.
acuminose adjective Terminating in a flat, narrow end.
acuminous adjective Characterized by acumen; keen.
acuteness noun The quality of being acute or pointed; sharpness; as, the acuteness of an angle., The faculty of nice discernment or perception; acumen; keenness; sharpness; sensitiveness; — applied to the senses, or the understanding. By acuteness of feeling, we perceive small objects or slight impressions: by acuteness of intellect, we discern nice distinctions., Shrillness; high pitch; — said of sounds., Violence of a disease, which brings it speedily to a crisis.