TRI- 



332 



TRO- 



trlqulnate (trikwi'nat) a. [L. tres, 

 three ; quint, five each.] Divided 

 into three, with each lobe again 

 divided into five (bot.). 



triradial (trira'dial) a. [L. tres, three ; 

 radius, a ray.] Having three 

 branches as radii from one centre ; 

 appl. the orbital sulcus (anat). 



trisepalous (trisep'alus) a. [Gk. tria, 

 three ; Gk. sepalon, a sepal.] H aving 

 three sepals (bot.). 



triseptate (trisgp'tat) a. [L. tres t 

 three ; septum, a partition.] Having 

 three partitions or septa, as a fruit 

 (bot.). 



triserlal (trlse'rial) a. [L. tres, three ; 

 series, a row.] Arranged in three 

 rows ; having three whorls (hot.). 



trisporous (trispo'rus) a. [Gk. tria, 

 three ; sporos, seed.] Also tri- 

 sporic, having three spores (hot.}. 



tristachyous (trlsta'kius) a. [Gk. tria, 

 three ; stachys, an ear of corn.] 

 With three spikes (bot.). 



tristichous (tris'tikus) a. [Gk. tria, 

 three ; stichos, row.] Arranged in 

 three rows (dot.), 



triternate (triteYnat) a. [L. tres, 

 three ; terni, three each.] Thrice 

 ternately divided (bot.). 



tritoblasts (tri'toblasts) n. plu. [Gk. 

 tritos, third ; blastos, bud.] A 

 generation of Neosporidia produced 

 by deutoblasts and in turn giving 

 rise to teloblasts (zool.). 



tritocerebron (tri'toser'e'bron) n. [Gk. 

 tritos, third ; kerebron, brain. J A 

 third lobe of an insect brain indi- 

 cated during development (emb.). 



trltocerebrum (tri'toseVebrum) n. 

 [Gk. tritos, third ; L. cerebrum, 

 brain.] Part of the brain of higher 

 Crustacea, consisting of antennal 

 nerve centres (zool.). 



tritocone (trl'tokon) n. [Gk. tritos, 

 third ; konos, cone.] A cusp of a 

 premolar tooth (zool.). 



tritozooid (tri'tozo'oid) n. [Gk. tritos, 

 third ; zoon, animal ; eidos, form.] 

 A zooid of the third generation 

 (zool). 



trltubercular (trltubeVkular) a. [L. 

 treS) three ; tuberculum, a small 

 hump.] Appl. molar teeth with 

 three cusps ; tricuspid. 



trituberculy (trltubeYkuli) n. [L. 

 (res, three ; tuberculum. a small 



hump.] A theory of molar tooth 

 development. 



triungulin (trlung'gulm) n. [L. tres, 

 three ; ungula, a claw.] Also 

 triungulus, the small, six-legged 

 larva of Strepsiptera and Canthar- 

 idae (zool.). 



trivium (triv'ium) n. [L. trivium, a 

 cross-road.] The three rays of a 

 starfish farthest from the madre- 

 porite ; cf, bivium (zooL). 



trizoic (trlzo'ik) a, [Gk. tria, three ; 

 zoon, animal.] Appl, a protozoan 

 spore containing three sporozoites 

 (zool), 



trochal (trS'kal) a. [Gk. trocko^ 

 wheel.] Wheel-shaped; appl. the 

 anterior disc of Rotifers (zool.). 



trochanter (trokan'ter) n. [Gk. tro- 

 chanter, a runner.] Appl. processes 

 or prominences at the upper end 

 of the thigh-bone a greater, lesser, 

 and sometimes a third (anat.) ; the 

 small segment of an insect leg 

 between coxa and femur (zool.). 



trochanteric fossa, a deep de- 

 pression on the medial surface of 

 the neck of the femur (anat.). 



trochantin (trdkan'tin) n. [Gk. tro- 

 chanter, a runner.] A short joint 

 which may follow the trochanter 

 of an insect leg (zooL). 



trochate (tro'kat) a. [Gk. trochos, a 

 wheel.] Having a wheel-like struc- 

 ture ; wheel-shaped (zool.). 



trochif erous, trochate. 



trochiform, trochate. 



trochlea (trok'lea) n. [Gk. trochilia, 

 a pulley.] A pulley-like structure 

 through which a tendon passes ; 

 appl. such a surface of humerus, 

 femur, orbit (anat.). 



trochlear (trok'lear) a. [Gk. trochilia, 

 a pulley.] Shaped like a pulley ; 

 pert, a trochlea (anat.). 



trochoid (tro'koid) a. [Gk. trochos, 

 wheel ; eidos, form.] Wheel-shaped ; 

 capable of rotating motion, as a 

 pivot-joint (anat.). 



trochophore (trok'ofor) n. [Gk. 

 trochos, wheel ; pherein, to bear.] 

 A trochosphere. 



trochosphere (trok'osfer) n. [Gk. 

 trochos, wheel ; sphaira, globe.] 

 The free - swimming pelagic larva 

 stage of many Worms and some 

 Molluscs (zool.). 



