2. (Zoöl.) (a) 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. (b) 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.
3. (Antiq.)
Defn: A breastplate, cuirass, or corselet; especially, the breastplate worn by the ancient Greeks.
THORIA
Tho"ri*a, n. Etym: [NL. See Thorite.] (Chem.)
Defn: A rare white earthy substance, consisting of the oxide of thorium; — formerly called also thorina.
THORIC
Thor"ic, a. (Chem.)
Defn: Of or pertaining to thorium; designating the compounds of thorium.
THORITE
Tho"rite, n. Etym: [So called by Berzelius from the Scandinavian god
Thor. See Thor.] (Min.)
Defn: A mineral of a brown to black color, or, as in the variety orangite, orange-yellow. It is essentially a silicate of thorium.
THORIUM
Tho"ri*um, n. Etym: [NL. See Thorite.] (Chem.)