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GLOSSARY. 



Tetrapod. An insect having only four 

 perfect legs. 



Tetrapterous. Having four wings. 



Theca. The sheath or case of the pro- 

 boscis in insects. 



Theory. An exposition of the general 

 principles of any science ; or, the sci- 

 ence, distinguished from the practice, 

 of an art. 



Thermal. Pertaining to heat; as, ther- 

 mal waters, warm or tepid mineral 

 waters. 



Thoracic. Pertaining to the breast, or 

 thorax ; as, the thoracic arteries. Also 

 belonging to an order of bony fishes, 

 respiring by means of gills only, the 

 character of which is that the branchia 

 are ossiculated, and the ventral fins 

 are placed underneath the thorax, or 

 beneath the pectoral fins. 



Thorax. The anterior mass in pedun- 

 culated insects. 



Thrill. To feel a sharp tingling or shiv- 

 ering sensation running through the 

 body. 



Throb. To beat rapidly, as the heart or 

 pulse, in consequence of agitation. 



Tibia. The third portion of the legs in 

 insects. 



Tibial. Belonging to the tibia; as the 

 tibial arteries. 



Tiercel, or Tiercelet. In falconry, a name 

 given to the male hawk, as being a 

 third part less in size than the female. 



Titillate. To excite by tickling. 



Torose. Swelling into knobs or protuber- 

 ances. 



Tomentose. Covered with short, inter- 

 woven, inconspicuous hairs. 



Toneless. Having no tone ; unmusical. 



Topazine. The yellow splendor of the 

 topaz. 



Topical. Limited; local, as a topical 

 remedy. 



Tortoise-shell. The shell or scales of the 

 . tortoise, a valuable article in various 

 manufactures. 



Tortuous. Twisted, wreathed, winding. 



Torulose (joints of insects). When they 

 are a little tumid. 



Toxicology. A treatise or discourse on 

 the nature of poisons. 



Tracheae. The air-tubes, which in in- 

 sects are the organs of respiration. 



Tracheal. Pertaining to the trachea or 



windpipe. 

 Trachelipods The Mollusca which have 



the locomotive disc or foot attached to 



the head. 

 Tracheotomy. The surgical operation of 



making an opening into the windpipe. 

 Tractile. Capable of being drawn out in 



length. 

 Train-oil. The oil produced from the 



blubber or fat of whales by boiling. 

 Tramosericeous. The splendor of satin. 

 Transfigured. Changed in form. 

 Transformed. Changed in form or ex- 

 ternal appearance. 

 Transfused. Poured or transferred from 



one vessel into another. 

 Translucent; Translucid. Transparent; 



clear. 

 Transmarine. Living or being beyond 



the sea. 

 Transmigrate^/. Passing from one place, 



body, or state to another. 

 Transmitted. Caused or suffered to pass 



through ; as, sound is transmitted by 



means of vibrations of the air. 

 Transpire. To exhale; to pass off by 



insensible perspiration. 

 Transude. To pass through the pores or 



interstices of texture, as perspirable 



matter or other fluid. 

 Transverse. Crossing each other: when 



the longitudinal line is cut through at 



right angles. 

 Trapezate. Quadrilateral with the four 



sides unequal, and none of them per- 

 fectly parallel. 



Trapeziform. Shaped like a trapezium. 

 Trapezoid. Quadrilateral, with two sides 



unequal and parallel. 

 Tread. To step or walk ; to copulate, as 



fowls. 



Trematoda. The order of Entozoa char- 

 acterized by suctorial pores. 

 Trenchant. Sharp; cutting; as trenchant 



claws. 



Trichotomous. Divided into three parts. 

 Tridactyle. Three-fingered. 

 Tridactylous. Having three toes. 

 Tridentate. Having three teeth. 

 Triedral. Having three sides. 

 Triform. Having a triple form or shape. 

 Trigonal. Having three angles. 

 Trilobate. Divided into three lobes. 



