a. and sb. Zool. [f. mod.L. Tripylæa, neut. pl. (f. Gr. τρι-, TRI- + πύλη gate) + -AN.] a. adj. Belonging to the division Tripylæa of radiolarians, characterized by having three openings into the central capsule. b. sb. A radiolarian of this division.
1888. Rolleston & Jackson, Anim. Life, 879 (Radiolaria). Some tripylean Phaeodaria, i. e. those with three apertures to the central capsule.
1902. Cassell’s Encycl. Dict., Supp., Tripylæan a. and s.
