Defn: To make sad. [Obs.] Feltham.
TRISTOMA
Tris"to*ma, n. Etym: [NL., from Gr. Tri-) + (Zoöl.)
Defn: Any one of numerous species of trematode worms belonging to Tristoma and allied genera having a large posterior sucker and two small anterior ones. They usually have broad, thin, and disklike bodies, and are parasite on the gills and skin of fishes.
TRISTY
Trist"y, a.
Defn: See Trist, a. [Obs.] Ashmole.
TRISULC
Tri"sulc, n. Etym: [L. trisulcus; tri- (see Tri-) + sulcus a furrow.]
Defn: Something having three forks or prongs, as a trident. [Obs.]
"Jupiter's trisulc." Sir T. Browne.
TRISULCATE
Tri*sul"cate, a. Etym: [Pref. tri- + sulcate.]
Defn: Having three furrows, forks, or prongs; having three grooves or sulci; three-grooved.
TRISULPHIDE
Tri*sul"phide, n. Etym: [Pref. tri- + sulphide.] (Chem.)