noun, plural glochidia [gloh-kid-ee-uh] .
the larva of a freshwater mussel of the family Unionidae that lives as a temporary parasite in the gills or on other external parts of fishes.

1895–1900; < Neo-Latin < Greek glōch(ís) point of an arrow + -idion diminutive suffix

glochidial, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glochidium (ɡləʊˈkɪdɪəm)
n , pl -chidia
1.  a barbed hair, esp among the spore masses of water ferns and on certain other plants
2.  a parasitic larva of certain freshwater mussels that attaches itself to the fins or gills of fish by hooks or suckers
[C19: from New Latin, from Greek glōkhis projecting point]

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