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glochidium

noun
glo·​chid·​i·​um | \ glō-ˈki-dē-əm How to pronounce glochidium (audio) \
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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More from Merriam-Webster on glochidium

Britannica.com: Encyclopedia article about glochidium

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