Pl. stellæ. [L., lit. star.]
1. a. Zool. A star-sbaped projection on the surface of a coralline; also, a star-shaped sponge-spicule.
1828. Stark, Elem. Nat. Hist., II. 431. Surface rough with elevated pyramidal stellæ; stars conical, with a solid central axis.
b. Crystallogr. A stellate crystal.
1844. G. Bird, Urin. Deposits (1857), 238. The octohedra of oxalate may be readily detected mixed with the prisms or stellæ of the former [sc. phosphate of magnesia and ammonia].
