Meconidium

Mec`o`nid´i`um


n.1.(Zool.) A kind of gonophore produced by hydroids of the genus Gonothyræa. It has tentacles, and otherwise resembles a free medusa, but remains attached by a pedicel.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.