trigonous (trigon us)

[ gon1.] 1. Same as trigonal.-2. In bot., three angled; having three prominent longitudinal angles, as a stem or an ovary. Also trigonal. trigonum (tri-go'num), n. [NL., a triangular space or area. Specifically - ( a ) The trigonal space or area at the base of the urinary bladder, whose apex is at the beginning of the urethra, and whose other two angles are at the points of entrance of the ureters into the bladder: more fully called trigonum vesicæ. (b) A triangular depre ed space between the pulvinar and the peduncle of the pineal body: more fully called trigo num habenula. - Trigonum acustici, a triangular area on the floor of the fourth ventricle, just laterad of the ala cinerea, and inside the restiform tract: the str iæ acusticæ [L. tres ( tri- ), three, In bot., having three having three aper[Rare.] trihoral (tri-ho'ral), a. [L. tres (tri-), three, + hora, hour: see hour.] Happening once in every three hours. Lord Ellesmere. ( Worcester.) trijugate (tri-jö'gat), a. [L. trijugus, threefold ( It is a great convenience to have the tri junction of Tibet, India, and Burma focu ed within the four corners of a map. Athenæum, Jan. 29, 1887, p. 164. trilabe (trī'lab), n. [ τρεῖς ( τρι- ), three,+ λαβή, hold, handle, λαβ ), take.] A three-pronged surgical instrument for taking foreign bodies and small calculi from the bladder. It is so made that the prongs can be moved as desired after the instrument is in position.