Source : Webster's Revised Unabridged Dictionary (1913)

Tricurvate \Tri*cur"vate\ (tr[-i]*k[^u]r"v[asl]t), a. [Pref.
   tri- + curvate.] (Zo["o]l.)
   Curved in three directions; as, a tricurvate spicule (see
   Illust. of {Spicule}).