12 letter word starting with th

Words Parts of Speech Meaning/Definition/Similar Words
thalamocoele noun The cavity or ventricle of the thalamencephalon; the third ventricle.
thalamophora noun pl. Same as Foraminifera.
thalassinian noun Any species of Thalaassinidae, a family of burrowing macrurous Crustacea, having a long and soft abdomen.
thanksgiving noun The act of rending thanks, or expressing gratitude for favors or mercies., A public acknowledgment or celebration of divine goodness; also, a day set apart for religious services, specially to acknowledge the goodness of God, either in any remarkable deliverance from calamities or danger, or in the ordinary dispensation of his bounties.
thaumaturgic adjective Alt. of Thaumaturgical
thaumaturgus noun A miracle worker; — a title given by the Roman Catholics to some saints.
theanthropic adjective Alt. of Theanthropical
thecasporous adjective Having the spores in thecae, or cases.
theochristic adjective Anointed by God.
theocratical adjective Of or pertaining to a theocracy; administred by the immediate direction of God; as, the theocratical state of the Israelites.
theologaster noun A pretender or quack in theology.
theologizing present participle & vb. noun of Theologize
theopathetic adjective Alt. of Theopathic
theopneusted adjective Divinely inspired; theopneustic.
theopneustic adjective Given by the inspiration of the Spirit of God.
theorematist noun One who constructs theorems.
theorization noun The act or product of theorizing; the formation of a theory or theories; speculation.
theosophical adjective Of or pertaining to theosophy.
theosophized imp. & past participle of Theosophize
therapeutics noun That part of medical science which treats of the discovery and application of remedies for diseases.
therapeutist noun One versed in therapeutics, or the discovery and application of remedies.
theriodontia noun pl. An extinct order of reptiles found in the Permian and Triassic formations in South Africa. In some respects they resembled carnivorous mammals. Called also Theromorpha.
thermifugine noun An artificial alkaloid of complex composition, resembling thalline and used as an antipyretic, — whence its name.
thermochemic adjective Alt. of Thermochemical
thermochrosy noun The property possessed by heat of being composed, like light, of rays of different degrees of refrangibility, which are unequal in rate or degree of transmission through diathermic substances.
thermogenous adjective Producing heat; thermogenic.
thermometric adjective Alt. of Thermometrical
thermoscopic adjective Of or pertaining to the thermoscope; made by means of the thermoscope; as, thermoscopic observations.
thermostatic adjective Of or pertaining to the thermostat; made or effected by means of the thermostat.
thermotropic adjective Manifesting thermotropism.
thessalonian adjective Of or pertaining to Thessalonica, a city of Macedonia., A native or inhabitant of Thessalonica.
thibet cloth A fabric made of coarse goat’s hair; a kind of camlet., A kind of fine woolen cloth, used for dresses, cloaks, etc.
thick-headed adjective Having a thick skull; stupid.
thick-winded adjective Affected with thick wind.
thimbleberry noun A kind of black raspberry (Rubus occidentalis), common in America.
thin-skinned adjective Having a thin skin; hence, sensitive; irritable.
thiocarbonic adjective Same as Sulphocarbonic.
thiosulphate noun A salt of thiosulphuric acid; — formerly called hyposulphite.
thomsenolite noun A fluoride of aluminium, calcium, and sodium occurring with the cryolite of Greenland.
thoracometer noun Same as Stethometer.
thorn-headed adjective Having a head armed with thorns or spines.
thoroughbred adjective Bred from the best blood through a long line; pure-blooded; — said of stock, as horses. Hence, having the characteristics of such breeding; mettlesome; courageous; of elegant form, or the like., A thoroughbred animal, especially a horse.
thoroughfare noun A passage through; a passage from one street or opening to another; an unobstructed way open to the public; a public road; hence, a frequented street., A passing or going through; passage.
thoroughness noun The quality or state of being thorough; completeness.
thoroughsped adjective Fully accomplished; thoroughplaced.
thoroughwort noun Same as Boneset.
thousandfold adjective Multiplied by a thousand.
three-decker noun A vessel of war carrying guns on three decks.
three-handed adjective Said of games or contests where three persons play against each other, or two against one; as, a three-handed game of cards.
three-leafed adjective Alt. of Three-leaved
three-leaved adjective Producing three leaves; as, three-leaved nightshade., Consisting of three distinct leaflets; having the leaflets arranged in threes.
three-nerved adjective Having three nerves.
three-parted adjective Divided into, or consisting of, three parts; tripartite.
three-square adjective Having a cross section in the form of an equilateral triangle; — said especially of a kind of file.
three-valved adjective Consisting of, or having, three valves; opening with three valves; as, a three-valved pericarp.
thrivingness noun The quality or condition of one who thrives; prosperity; growth; increase.
thunderburst noun A burst of thunder.
thundercloud noun A cloud charged with electricity, and producing lightning and thunder.
thunderproof adjective Secure against the effects of thunder or lightning.
thunderstone noun A thunderbolt, — formerly believed to be a stone., A belemnite. See Belemnite.
thunderstorm noun A storm accompanied with lightning and thunder.
thymiatechny noun The art of employing perfumes in medicine.
thysanoptera noun pl. A division of insects, considered by some writers a distinct order, but regarded by others as belonging to the Hemiptera. They are all of small size, and have narrow, broadly fringed wings with rudimentary nervures. Most of the species feed upon the juices of plants, and some, as those which attack grain, are very injurious to crops. Called also Physopoda. See Thrips.