| Words | Parts of Speech | Meaning/Definition/Similar Words |
|---|---|---|
| objectionable | adjective | Liable to objection; likely to be objected to or disapproved of; offensive; as, objectionable words. |
| objectivation | noun | Converting into an object. |
| objectiveness | noun | Objectivity. |
| observational | adjective | Of a pertaining to observation; consisting of, or containing, observations. |
| observatories | plural | of Observatory |
| obsigillation | noun | A sealing up. |
| obstetricious | adjective | Serving to assist childbirth; obstetric; hence, facilitating any bringing forth or deliverance. |
| obtenebration | noun | The act of darkening; the state of being darkened; darkness. |
| obtuse-angled | adjective | Alt. of obtuse-angular |
| occasionalism | noun | The system of occasional causes; — a name given to certain theories of the Cartesian school of philosophers, as to the intervention of the First Cause, by which they account for the apparent reciprocal action of the soul and the body. |
| occasionality | noun | Quality or state of being occasional; occasional occurrence. |
| occipitoaxial | adjective | Of or pertaining to the occipital bone and second vertebra, or axis. |
| ochlocratical | adjective | Of or pertaining to ochlocracy; having the form or character of an ochlocracy; mobocratic. |
| octonaphthene | noun | A colorless liquid hydrocarbon of the octylene series, occurring in Caucasian petroleum. |
| odontographic | adjective | Of or pertaining to odontography. |
| odontophorous | adjective | Having an odontophore. |
| odontornithes | noun pl. | A group of Mesozoic birds having the jaws armed with teeth, as in most other vertebrates. They have been divided into three orders: Odontolcae, Odontotormae, and Saururae. |
| ogeechee lime | The acid, olive-shaped, drupaceous fruit of a species of tupelo (Nyssa capitata) which grows in swamps in Georgia and Florida., The tree which bears this fruit. | |
| old-fashioned | adjective | Formed according to old or obsolete fashion or pattern; adhering to old customs or ideas; as, an old-fashioned dress, girl. |
| old lang syne | See Auld lang syne. | |
| oleomargarine | noun | A liquid oil made from animal fats (esp. beef fat) by separating the greater portion of the solid fat or stearin, by crystallization. It is mainly a mixture of olein and palmitin with some little stearin., An artificial butter made by churning this oil with more or less milk. |
| oligopetalous | adjective | Having few petals. |
| oligosepalous | adjective | Having few sepals. |
| oligosiderite | noun | A meteorite characterized by the presence of but a small amount of metallic iron. |
| oligospermous | adjective | Having few seeds. |
| omnicorporeal | adjective | Comprehending or including all bodies; embracing all substance. |
| omniprevalent | adjective | Prevalent everywhere or in all things. |
| oneirocritics | noun | The art of interpreting dreams. |
| oneiroscopist | noun | One who interprets dreams. |
| onomatologist | noun | One versed in the history of names. |
| onomatopoetic | adjective | Of or pertaining to onomatopoeia; characterized by onomatopoeia; imitative; as, an onomatopoetic writer or word. |
| ontologically | adverb | In an ontological manner. |
| oosporangiums | plural | of Oosporangium |
| ophiomorphite | noun | An ammonite. |
| ophiomorphous | adjective | Having the form of a serpent. |
| ophthalmology | noun | The science which treats of the structure, functions, and diseases of the eye. |
| opisthoglypha | noun pl. | A division of serpents which have some of the posterior maxillary teeth grooved for fangs. |
| opisthography | noun | A writing upon the back of anything, as upon the back of a leaf or sheet already written upon on one side. |
| opportunities | plural | of Opportunity |
| oppositionist | noun | One who belongs to the opposition party. |
| orchesography | noun | A treatise upon dancing. |
| orchestration | noun | The arrangement of music for an orchestra; orchestral treatment of a composition; — called also instrumentation. |
| orchidologist | noun | One versed in orchidology. |
| orchilla weed | The lichen from which archil is obtained. See Archil. | |
| organicalness | noun | The quality or state of being organic. |
| organogenesis | noun | The origin and development of organs in animals and plants., The germ history of the organs and systems of organs, — a branch of morphogeny. |
| organographic | adjective | Alt. of Organographical |
| organological | adjective | Of or relating to organology. |
| organoplastic | adjective | Having the property of producing the tissues or organs of animals and plants; as, the organoplastic cells. |
| organotrophic | adjective | Relating to the creation, organization, and nutrition of living organs or parts. |
| orientalizing | present participle & vb. noun | of Orientalize |
| orismological | adjective | Of or pertaining to orismology. |
| ornamentation | noun | The act or art of ornamenting, or the state of being ornamented., That which ornaments; ornament. |
| ornithichnite | noun | The footmark of a bird occurring in strata of stone. |
| ornithologist | noun | One skilled in ornithology; a student of ornithology; one who describes birds. |
| ornithosauria | noun pl. | An order of extinct flying reptiles; — called also Pterosauria. |
| ornithotomist | noun | One who is skilled in ornithotomy. |
| orphanotrophy | noun | A hospital for orphans., The act of supporting orphans. |
| orthocarbonic | adjective | Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4. |
| orthoceratite | noun | An orthoceras; also, any fossil shell allied to Orthoceras. |
| orthodiagonal | noun | The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis. |
| orthodoxality | noun | Orthodoxness. |
| orthognathism | noun | The quality or state of being orthognathous. |
| orthognathous | adjective | Having the front of the head, or the skull, nearly perpendicular, not retreating backwards above the jaws; — opposed to prognathous. See Gnathic index, under Gnathic. |
| orthographist | noun | One who spells words correctly; an orthographer. |
| orthographize | verb t. | To spell correctly or according to usage; to correct in regard to spelling. |
| orthopinacoid | noun | A name given to the two planes in the monoclinic system which are parallel to the vertical and orthodiagonal axes. |
| orthospermous | adjective | Having the seeds straight, as in the fruits of some umbelliferous plants; — opposed to coelospermous. |
| orthostichies | plural | of Orthostichy |
| oryctological | adjective | Of or pertaining to oryctology. |
| ostensibility | noun | The quality or state of being ostensible. |
| ostreaculture | noun | The artificial cultivation of oysters. |
| ostreophagist | noun | One who feeds on oysters. |
| ourang-outang | noun | See Orang-outang. |
| outgeneralled | of Outgeneral | |
| outgeneraling | present participle & vb. noun | of Outgeneral |
| outrecuidance | noun | Excessive presumption. |
| overbounteous | adjective | Bounteous to excess. |
| overconfident | adjective | Confident to excess. |
| overcredulous | adjective | Too credulous. |
| overdelighted | adjective | Delighted beyond measure. |
| overexquisite | adjective | Too exquisite; too exact or nice; too careful. |
| overflowingly | adverb | In great abundance; exuberantly. |
| overfreighted | imp. & past participle | of Overfreight |
| overgreatness | noun | Excessive greatness. |
| overinfluence | verb t. | To influence in an excessive degree; to have undue influence over. |
| overlanguaged | adjective | Employing too many words; diffuse. |
| overlargeness | noun | Excess of size or bulk. |
| overliberally | adverb | In an overliberal manner. |
| overmultitude | verb t. | To outnumber. |
| overofficious | adjective | Too busy; too ready to intermeddle; too officious. |
| overponderous | adjective | Too heavy. |
| overprovident | adjective | Too provident. |
| overquietness | noun | Too much quietness. |
| overrighteous | adjective | Excessively righteous; — usually implying hypocrisy. |
| overshadowing | present participle & vb. noun | of Overshadow |
| overspreading | present participle & vb. noun | of Overspread |
| overstatement | noun | An exaggerated statement or account. |
| overstraining | present participle & vb. noun | of Overstrain |
| overvaluation | noun | Excessive valuation; overestimate. |
| ovoviviparous | adjective | Oviparous, but hatching the egg while it is within the body, as some fishes and reptiles. |
| oxygenizement | noun | Oxidation. |
| oxyhemoglobin | noun | See Hemoglobin. |
| ozonification | noun | The act or process of producing, or of subjecting to the action of, ozone. |