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Webster 1913 Edition

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Noun.

;

pl.

Glochidia

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[NL., fr. Gr. [GREEK] the point of an arrow.]

(Zool.)

The larva or young of the mussel, formerly thought to be a parasite upon the parent’s gills.

glochidium ‎(plural glochidia)

(zoology) The larva or young of the mussel.
Glochidia were once believed to be parasites on the gills of the parents.