glochidium

noun
glo·​chid·​i·​um | \glō-ˈki-dē-əm \
plural glochidia\-​dē-​ə \

Definition of glochidium 

: the larva of a freshwater mussel (family Unionidae) that develops as an external parasite on fish

First Known Use of glochidium

1875, in the meaning defined above

History and Etymology for glochidium

New Latin, from Greek glōchis projecting point + New Latin -idium

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The first known use of glochidium was in 1875

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