'Glochidium' definitions:

Definition of 'glochidium'

From: WordNet
noun
A barbed spine or bristle (often tufted on cacti) [syn: glochidium, glochid]

Definition of 'Glochidium'

From: GCIDE
  • Glochidium \Glo*chid"i*um\, n.; pl. Glochidia. [NL., fr. Gr. ? the point of an arrow.] (Zool.) The larva or young of the mussel, formerly thought to be a parasite upon the parent's gills. [1913 Webster]