USED IN NATURAL HISTORY. 



147 



mero, joint. A division of cole- 

 opterous insects. 



TETRA'O. Lat. A bustard. Syste- 

 matic name of the grouse. 



TETRAPE'TALOUS. Having four pe- 

 tals. 



TETRASE'PALOTTS. Having four se- 

 pals. 



TET'RODOW. fr. gr. tetra, four ; odous, 

 odontos, tooth. Systematic name 

 of certain fishes. 



TEXTURE. In geology, the mode of 

 aggregation of the mineral sub- 

 stances of which rocks are com- 

 posed. 



THA'tAMtrs. Lat. A bed. Torus. 

 Receptacle. In botany, the dilated 

 summit of the peduncle upon 

 which the carpels are seated. 



THA'HTJS. A flat membrane be- 

 longing to cellular plants. 



THAi/LOGENS.-fr. gr. thallo , to sprout ; 

 gennao, to produce. Thallophytes. 

 Flowerless plants, without stems, 

 roots or leaves. 



THE'A. A genus of plants of the 

 tribe of carnellese. The'a bohea, 

 Bohea tea ; Thea viridis, green 

 tea. 



THE'CA. fr. gr. theke, a case. In bo- 

 tany, the cavity of the anther; 

 the sporangium of ferns ; the urn 

 of mosses, &c. 



THE'INE. The proximate principle 

 of tea. 



THE'CAPHORE fr. gr. theke, a cap- 

 sule ; pher&, to bear. Gynophore. 

 Podogynium. The stalk upon 

 which the ovary of plants is 

 sometimes seated. 



THECos'TOMEs.-fr. gr.theke, a sheath ; 

 stoma, a mouth. Insects which 

 have a sucking-apparatus contain- 

 ed in a sheath, are so named. 



THELPHU'SA. A genus of crusta- 

 ceans. 



THER'MAL. fr. gr. thermos, heat. 

 Warm ; belonging or relating to 

 heat. 



THE'RMOMETER. fr. gr. therme, heat ; 

 metron, measure. An instrument 

 for measuring heat. 



THEU'TYES. Systematic name of a 

 family of fishes. 



THIIT OUT. Strata are said to thin 

 out when they diminish in thick- 

 ness. 



THO'RACIC. Thonging to the thorax. 



THO'RAX. fr. gr. thorax, the chest. 

 It is bounded posteriorly by the 

 vertebrae; laterally, by the ribs 

 and scapula ; anteriorly, by the 

 sternum ; above, by the clavicle ; 

 and below, by the diaphragm. It 

 is destined to lodge and protect 

 the chief organs of respiration 

 and circulation : the lungs and 

 heart. 



THORN. A sharp process from the 

 woody part of a plant. 



THREADS. In botany, long delicate 

 hairs. 



THROAT. In botany, the orifice of 

 a flower. 



THT'MALLUS. Systematic name of 

 the graylings. 



THTN'IOJS. Systematic name of the 

 tunny. 



THT'RSE. ) In botany, a kind of 



THY'RSUS. cluster. A compact 

 panicle, the middle branches of 

 which are longer than those of 

 the apex, or of the base, as lilac. 



THVRSOID. Resembling a thyrsus. 



THYSAITOU'RA. fr. gr. thusanai, 



fringes ; owro, tail. An order of 

 insects. 



TI'BIA. Lat. A flute. The largest 

 bone of the leg is so called. A 

 leg. 



TI'BIJB. Lat. plur. of tibia. 



TI'GRIS. Lat. A tiger. 



Ti'ifCA. Lat. A tench. 



TI'DAL. Relating to tides. Tidal 

 wave is the elevation of the water 

 of the ocean produced by the at- 

 traction of the moon. 



TI'MIDUS. Lat. Timid. 



TI'NEA. Lat. A moth-worm, that 

 eats clothing, books, &c. 



TI'NEK. Lat. plur. of tinea. 



TICHODRO'MA Systematic name of 

 certain creepers. 



TI'SSUE. fr. lat. texere. to weava. 



