TRICHLORIDES 



331 



TRISECTION 



Trichlorides, (tri-klo'ridz). [Tri and Chloride, 

 0.v.]=Terchlorides: compounds of one atom 

 of a metal with three atoms of chlorine. 



TrichocephaluB, (trik-d-sefa-lus). [Gk. thrix, 

 hair; kephale, head.] A nematoid worm. 



Trichodesmium, ( trik-6-dez'mi-um ). [ Gk. 

 thrix, hair; desme, bundle.] A plant belong- 

 ing to Algae; also called Sea-dust. 



Trichomei, (trik'omz). [Gk.- trichonut, hairy- 

 ness.] Hairs on roots, underground stems, 

 bases of leaf-stalks, tc. 



Trichoptera, (trik-op'ter-a). [Gk. thrix, hair; 

 ptcron, wing.]=Caddis flies: name proposed 

 for a new order, separated from Neuroptera. 



Trichospermi, ( trik-d-sper'nij ). [Gk. thrix, 

 hair; spernia, seed.] Puff-balls, &c.: fungi 

 belonging to Gasteromycetes. 



Trichotomy, (tri-kot'6-mi). [Gk. tricha, in 

 three; temno, I cut.] Continual division into 

 threes, cf. Dichotomy. 



Trichroism, ( tri-kro'izm ). [Gk. tri, three; 

 chroma, colour.] Having three colours, ac- 

 cording to direction of view. 



Triclinic, (tri-kli'nik). [Gk. tri, three; klino, 

 I bend.] T. minerals have three axes, each 

 oblique to the others. 



Tricuspid, (tri-kus'pid). [L. tres, three; cuspi*, 

 point.] Three-pointed. T. valve: in the 

 heart. 



Tridymite, (trid'i-mlt). A mineral, belonging to 

 the quartz group, composed chiefly of silver. 



Tnesneter. A crater in Moon 20 miles in 

 diameter. 



Triethylic ether=C7Hi8O 3 : a heavy aromatic 

 fluid; a powerful anaesthetic. 



Trifolium, (tri-fo'li-um). [Tri, q.v.', L. folium, 

 leaf.]=Trefoil, clover, &c. : a small herb be- 

 longing to Fabaceae. 



Triforium, (tri-fo'ri-um). [Tri, q.v.; L. forig, 

 door.] A gallery in the side of the nave of a 

 church. 



Trigeminal nerves, (tri-jem'i-nal). [Tri, fl.r. ; 

 L. gemini, double.] The fifth pair of cerebral 

 nerves; large nerves supplying the jaws, &c. 



Trigla, (trig'la)=Gurnard: a fish belonging to 

 I/oricati, 



Trigonella, (tri-gp-nella). [Gk. treit, three; 

 ftonia, angle.J=Fenugreek: a plant belonging 

 to Leguminacejw. 



Trigonia, (tri-g6'ni-a). [Gk. treis, three; gonia, 

 angle.] A mollus- 

 cous animal, shells 

 of which are found 

 in Cretaceous and 

 Jurassic rocks. 



Trigonicarpa, (tri- 

 gon- i -kar'pa). 

 [Gk. treis, three; 

 gonia, angle; kar- 

 pos, fruit.] Nuts 

 of coniferous 

 plants found fos- 

 silised in coal. 



Trigonometry,(trig- 

 6-nom'e-tri). [Gk. 

 treis, three; gonia, Trigonia costata. 



angle; metron, measure.] Originally used 

 for the measurement of triangles; now used 

 also for other mathematical calculations. 



Trilliaceae, ( tril-li-a'se-6 ). [ Trillium, the 

 typical genus. ]=Parids: herbs with large 

 flowers, forming a division of Dictyogens. 



Trilobita, (tri-lob'i-ta). (Gk. treis, three; lobos, 

 lobe.]=Trilobites: fossil crustaceans, of many 

 genera: three lobes and sessile eyes, may have 

 had legs, and belonged to Isopoda; extinct 

 since Primary period, the last being found 

 in carboniferous rocks; e.g., asaphus, caly- 

 mene, phacopa, and trinucleus are trilobites. 



Pi..-, ;. 



Trinucleus flmbriixtus. 



Trimera. (tri-mo'ra). [Gk. treit, three; inerot, 

 part.] Ladybirds, Ac.: small beetles, belong- 

 ing to Coleoptera. 



Trimeresuri. A poisonous snake of India, 

 belonging to Crotalidae. 



Trimetrio, ( tri-met'rik ). [Gk. treis, three; 

 metron, measure.] T. crystals; those having 

 three unequal angles. 



Trimorphism, (tri-morfizm). [Gk. treis, three; 

 morphe, form.] Having three forms, as in 

 some butterflies, Crustacea, and plants, cf. 

 Dimorphism. 



Tringa, (tring'ga). Sand-piper: a bird belong- 

 ing to Charadriadae. T. canutus : knot-piper, 

 belongs to Scolopacidee. 



Trinia, (trin'i-a). A plant belonging to Api- 

 aceaj; also called Hone-wort. 



Trinitrocellulose, (tri-ui-tro-sel'u-los) = Gun- 

 cotton, q.v. 



Trinitroresorcin, (tri-ni-tro-re-sor'sin) = Oxy- 

 picric ncid, q.v. 



Trionycidae, (tri-6-ni'si-de). [Trionyx, q.v.; 

 Gk. eidos, form.] = Mud-turtles=Soft tor- 

 toises: fresh -water carnivorous. 



Trionyx,(trl'6-niks). [Gk. r,three ; onyx, claw.] 

 Mud-turtle; a variety of the turtle. v.Chelonia. 



Tri-oxides: of the type H 6 3 ; metallic anhy- 

 drides of strongly acid character. 



Tripe de roche. [The French name.]=Gyro- 

 phora: a lichen, also called Lecanora. 



Triphane, (trl'fan). [Gk. triphunes, thrice.] 

 A mineral, chiefly silicate of aluminum and 

 lithium. 



Triplicate ratio, (trip'li-kiit). [L. triplicate, 

 threefold.]=Threefold: the ratio of the cubes 

 of two numbers is the triplicate ratio of the 

 numbers themselves. 



Tripoli, (trip'6-li). [Tripoli in Africa.]=Moun- 

 tain meal=:Infusorial earth: a siliceous stone 

 composed of remains of microscopic plants. 



Tripod of life. Term used by Bichat for brain, 

 heart, and lungs. 



Trisection, ( trl-sek'shun ). [L. tra, three; 



