TRAP 



330 



TRICHIURUS 



Trap, (trap). [Sw. tmppa, stair.]=Green- 

 stone: an ancient volcanic rock, a compound 

 of felspar and horubleude=Lava that has 

 been injected. 



Trap-door spider. A burrowing spider. 



Trapa, (tri'pa)=Water caltrops: an aquatic 

 plant belonging to Una- 



Trapezium, (tra-pe'zi-um). 



[The Latin name.] Any 



plane figure formed by 



four straight lines: used 



only when it has no re- 



gular form, none of the 



sides being parallel. 

 Trapezoid, (trap e-zoid). [Trapezium, q.v.; 



Ok. eidot, form.] A plane figure formed by 



four straight lines, two of 



which are parallel. 

 Trapezohedron, (trap--z6- 



hGd'ron ). [ Trapezium. 



g.v.: Ok. hedron, face.) 



A solid figure formed by 



\ 



twenty-four equal trapeziums. 



Trappean rocks, (trap'e-an). [Trap, q.v.] Un- 

 Gratified rocks, including basalt, greenstone, 

 iHirphyry, Ac. = Volcanic rocks. 



Trass, (tra). (Tarratt, the German word.] A 

 stratum of rolcanic deposit resembling puz- 

 zuolana. 



Traveller's joT=ClnJiti. 9.9. 



Traverse sailing, v. Sailing. 



Travertin, (trav'cr-tlnY. [The FVench word.] 

 LJBsto<sdyositsdnomejJoMjoM spring* 



Trawl, (trawl). A large bag net, dragged along 

 the bottom of the water. 



Treacle, (tnTkl)= Molasses, 7.9. T. muttard 

 = Erysimum, q.v. 



Tread, (tred)=Cicatricnla, q.v. 



Tree, (tru). [Trto, the A.-S. name,] A plant 

 of large size, having a perennial stem or 

 trunk: also considered as a colony of plants. 

 Cotton r.=Gossypiuin t q.v. Cotton T. of 

 India = Bombax. Fire T. = Nuytia, q.v. 

 Ortua T. = Xanthorrhrea, q. r. Gum T. = 

 Eucalyptus. Hand 7\=Cheirotemon plata- 

 noides. Lead 7*.= Arbor Saturni, v. Lead 

 tree. Mammoth T., v. Mammoth tree. Man- 

 go r. = MangiferaIndica. Paint T.,v. Pal- 

 inacefla. T. c{uH&er=Auabas, q.v. T. cro6= 

 Birgus, q.v. T. /<rrn=Cyathea. T. frog 

 Hyla, q.v., found especially in 8. America: 

 adapted to tree-life by the digit* ending in 

 suckers. T. fn-nMAo/xrr = Ieconema varia, 

 T. tanparoo=Phalangista. Cuscns, and other 

 genera. T. waftoie=Lavatera, q.v. T. naiU: 

 long wooden bolts used in shipbuilding, &c. 

 T. erj>eH<*=Leptophina, q.v. T. KOP= 

 Vespa arborea. 



Tree-like= Dendriform. 



Trefoil =Thfolium. Birtfsfoot: l.=Ornitho- 

 pus: 2. = Lotus. Hop T. = Trefolram pro- 

 cumbens. 



Trefolium=Trefoil=Trifolium, q.v. 



Trehalo8e=Mjcose, q.v. 



Tremadoo slates, (trC'ma-dok). [T. in Car- 

 narvonshire. ] The uppermost division of the 

 Cambrian group. 



Tremandrac8e,(trC-man-dra'se-e). [Tremandra, 



the typical genus.] = Pore- worts: slender hairy 

 shrubs with showy flowers, belonging to 

 Saptndales. 



(trt-mvto'da). [Ok. Irtmatodtt, 

 full of holes. ]=TremaUxfes= Flukes: animals 

 belonging to Bootofiirli. having but one open- 

 ing: a division of Sterelmintba, q.v. 



Tremohte, (trem'6-lit). (Tremola. in Switzer- 

 land.] A mineral of the Amphibole group, 

 a white variety of hornblende. 



Trepan, (tre-pan'). [The French word.] A 

 BTgioal instrument used for the removal of 

 a jwrtion of bone. 



Trepanga, (tre-pnngzO- Animals belonging to 

 Holothurtdea ; used for food, 



Trephine, ftre-fen'). [Trepan, g.v.] A modi- 

 fication of the trepan, q.v. 



Tresses. Lad ft 3*. =8piranthes auturonalia. 



TrwiaowB, (tro-i-l'se^f. [Dr. Trewof N urem- 

 burg.) Tropical plant* belonging to 1 

 biaceie, sometimes considered as a separate 

 order. 



Tri- (tri). (L. trtt, three.] A prefix implying 

 three. 



Triada, (triadx). [Tri, o.r.]=Triatomic=Ter- 

 valent; chemical elementa, one atom of hu-li 

 is equivalent to three atoms of hydrogen, 

 boron, gold, thallium, Ac. 



Thanudea, (tri'a-midz). (Tri and Amides, q. v.] 

 Compound* of three atoms of amnx 

 whiA the hydnifeu is partly or wholly re- 



Tnammoaias, ( tri-am-ma'ni-az ). [Tri and 



Amn)onia,7.p.)=Triatomicbases=Triamiues: 



bases formed from triatomic alcohols. 

 Triangle, (tri-ang'glX [Tria*g*l*in, the Latin 



word.] A figure formed 



by three straight lines. 



each intersecting both the 



Others; which, if it were 



to revolve round one ex- 



tremity of the base, would 



form a cone. Itotctltt T.: 



one of which two of the 



aides are equal. Ratio* of a T.,r. Sine, Conine, 

 Tangent, Cotangent, Secant, Cosecant. Solu- 

 tion of a T., v. Solution. 



Triangulum, ( tri-ang'Q-lum ). [ The Latin 

 wonl.]=The Triangle: a small northern con- 

 stellation. 



Triangulum Australis= the Southern Tr 

 a small constellation near the South 

 having three bright stars. 



Trias, (tri as). [Ok. tritu, triple.] =New Red 

 Sandstone: a series of strata intermediate 

 between the Carboniferous and Lias forma- 

 tions: divisible into three groups, of which 

 only the highest and lowest are known in 

 England. Upper 2r.=Keuper. Middle T. 

 = Muschelkalk. Lover T.=Buntr. 



TrichechusXtriTce-kus). (Ok. frfeft0rAtt.li.ivi ng 

 hair. ] Morse, sea-cow, sea-horse, Ac. ; an aqua- 

 tic mammalian an imal , belongi ng to I'l , 



Trichina, (trik-i'na). [Ok. trichina*, hairv .] 

 A microscopic parasitic worm, found in 

 human muscles, belonging to Entozoa. 



Trichiurus, ( trik-i-Q'rus ). [ Gk. trichiu, 

 hairy; ouro, taiL]=IIair-tail: a fish belong- 

 ing to Tamioides. 



