glochidium noun. [glǝʊ'kɪdɪǝm] Pl. -dia [-dɪǝ]. L19.
[mod. Latin from Greek, dim. of glōkhis arrowhead.]
1. Zoology. The parasitic larva of certain freshwater mussels, which attaches to the fins or gills of fish by suckers or hooks. L19.

2. Botany. A barbed hair or bristle; spec. a barbed organ of attachment on the surface of a spore mass, as in the aquatic fern Azolla. L19.

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