glochidium

/G L AA1 K IH1 D IY0 AH0 M/
noun
  1. 1

    The larva or young of the mussel.

    โ€œGlochidia were once believed to be parasites on the gills of the parents.โ€

  2. 2

    A glochid, or cactus spine.

Source: https://en.wiktionary.org/wiki/glochidium