Definition of: glochidium

(glō·kid′ē·əm) noun plural ·chid·i·a (-kid′ē·ə) Zool.
A larva of a mussel with a bivalve embryonic shell provided with hooked processes by which it may attach itself to a fish and there pass a brief phase of its life. [<NL, dim. of Gk. glōchis point of an arrow]