‖n. [ NL., dim. fr. L. serta a garland. ] (Zool.) A genus of delicate branching hydroids having small sessile hydrothecae along the sides of the branches. [ 1913 Webster ]
n. (Zool.) Any species of Sertularia, or of Sertularidae, a family of hydroids having branched chitinous stems and simple sessile hydrothecae. Also used adjectively. [ 1913 Webster ]