TBJ 



424 



XRU 



eidos, resemblance), in zoo?., a 

 zooid of the third generation. 



trituration, n., trit'-ur-a'shttn (L. 

 tritura, a rubbing or wearing 

 out), the act of reducing a sub- 

 stance to a fine powder by rub- 

 bing. 



trivial names, tritf-1-al ndmz (L. 

 trividlis, that may be found every- 

 where from trivium, a cross- 

 road), the names added to the 

 names of genera, which double 

 or binomial names constitute the 

 names of species, as Triticum, 

 the generic name of certain 

 cereals, while Triticam vulgare 

 is the specific name of one of the 

 genus, viz. common wheat : see 

 Appendix on Specific Names. 



trochal, a., trok'-al (Gr. trochos, a 

 wheel), wheel - shaped applied 

 to the ciliated discs of the 

 Rotifera. 



trochanter, n., trok-ant'er (Gr. 

 trochanter, a runner from troch- 

 ao, I roll or run round), one of the 

 two processes or prominences at 

 the upper part of each thigh- 

 bone, named respectively the 

 major and the minor; they 

 receive the large muscles which 

 bend and extend the thigh, and 

 turn it upon its axis, thus form- 

 ing, as it were, a shoulder to each 

 thigh-bone : trochanteric, a., 

 troK-ant-Vr'-ik, of or pert, to the 

 trochanters. 



trochar, n., trdk'dr (F. trocar, a 

 trocar ; trois-quarts, three-fourths 

 from L. tris, three ; quartus, 

 the fourth), a surgical instrument 

 for taking off fluids from parts of 

 the body, as in dropsy, so named 

 from its triangular point. 



trochlea, n., trok'le-a (L. trochlea, 

 a case containing one or more 

 pulleys ; Gr. trochos, a wheel), a 

 pulley - like cartilage through 

 which the tendon of the trochleary 

 muscle passes : trochlearis, n., 

 trd'U'dr f >is, one of the projec- 

 tions of bones over which parts 

 turn as ropes over pulleys : troch- 



lear, a., rtf&?fiMfr, shaped like a 

 pulley : trochleary, a. , tr8k'-!&' 

 dr'4, of or pert, 3o the trochlea : 

 trochlear surface, the smooth 

 surface of the trochlea. 



trochoid, a., trolc'-oyd (Gr. trochds, 

 a wheel ; eidos, resemblance), 

 conical, with a flat base, as the 

 shells of Foraminifera. 



Tropaeolacese, n. plu., trop-e'-dl-d'- 

 se-e (Gr. trdpaion, a trophy), the 

 Indian -Cress family, an Order of 

 plants, having showy flowers, and 

 more or less pungency, used as a 

 cress : Tropseohim, n., trop-e'-ol- 

 urn, a showy genus of plants, so 

 named from their leaves resem- 

 bling a buckler, and their flowers 

 a helmet : Tropseolum majus, 

 mddf-us (L. major, and majus, 

 greater), common Indian-Cress, 

 or Garden Nasturtium, whose 

 unripe fruit has been pickled, 

 and used as capers : T. tuberos- 

 um, tub'-er-dz'-um (L. tubZrosus, 

 having fleshy knots from tuber, 

 a protuberance), a species whose 

 roots are eaten in Peru. 



trophi, n. plu., trdf'i (Gr. trophtis, 

 rearing, nursing), the parts of the 

 mouth in insects concerned in 

 the acquisition and preparation 

 of food: trophic, a., trtif-flc, 

 connected with nourishment ; 

 nourishing ; nutritious : tropho- 

 some, n., trof'-d-sdm (Gr. soma, 

 body), the collective assemblage 

 of the nutritive zooids of any 

 Hydrozoon. 



trophosperm, n., trof'o-sperm 

 (Gr. trdphos, rearing, nursing ; 

 sperma, seed), in bot., a name 

 applied to the placenta. 



truncate, a. , tr&ngk'-dt, also trunc- 

 ated, a., trungk'dt'ed (L. trunc- 

 dtum, to maim, to mutilate 

 from truncus, the bole or trunk 

 of a tree), in bot., terminating 

 very abruptly, as if cut off at the 

 end ; in zool. , abruptly cut off, 

 as univalve shells, whose apex 

 breaks off, the shells thus becom- 

 ing decollated: truncus, n., 



