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- English Word Thoracotomy Definition The operation of opening the pleural cavity by incision.
- English Word Thoral Definition Of or pertaining to a bed.
- English Word Thorax Definition The part of the trunk between the neck and the abdomen, containing that part of the body cavity the walls of which are supported by the dorsal vertebrae, the ribs, and the sternum, and which the heart and lungs are situated; the chest.
- English Word Thorax Definition The middle region of the body of an insect, or that region which bears the legs and wings. It is composed of three united somites, each of which is composed of several distinct parts. See Illust. in Appendix. and Illust. of Coleoptera.
- English Word Thorax Definition The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix.
- English Word Thorax Definition A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.
- English Word Thoria Definition A rare white earthy substance, consisting of the oxide of thorium; -- formerly called also thorina.
- English Word Thoric Definition Of or pertaining to thorium; designating the compounds of thorium.
- English Word Thorite Definition A mineral of a brown to black color, or, as in the variety orangite, orange-yellow. It is essentially a silicate of thorium.
- English Word Thorium Definition A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; -- formerly called also thorinum. Symbol Th. Atomic weight 232.0.
- English Word Thorn Definition A hard and sharp-pointed projection from a woody stem; usually, a branch so transformed; a spine.
- English Word Thorn Definition Any shrub or small tree which bears thorns; especially, any species of the genus Crataegus, as the hawthorn, whitethorn, cockspur thorn.
- English Word Thorn Definition Fig.: That which pricks or annoys as a thorn; anything troublesome; trouble; care.
- English Word Thorn Definition The name of the Anglo-Saxon letter /, capital form /. It was used to represent both of the sounds of English th, as in thin, then. So called because it was the initial letter of thorn, a spine.
- English Word Thorn Definition To prick, as with a thorn.
- English Word Thorn-headed Definition Having a head armed with thorns or spines.
- English Word Thornback Definition A European skate (Raia clavata) having thornlike spines on its back.
- English Word Thornback Definition The large European spider crab or king crab (Maia squinado).
- English Word Thornbill Definition Any one of several species of small, brilliantly colored American birds of the genus Rhamphomicron. They have a long, slender, sharp bill, and feed upon honey, insects, and the juice of the sugar cane.
- English Word Thornbird Definition A small South American bird (Anumbius anumbii) allied to the ovenbirds of the genus Furnarius). It builds a very large and complex nest of twigs and thorns in a bush or tree.