hydrachnid

Hydrachnid

Hy*drach"nid\, n. [Hydr- + arachnid.] (Zo["o]l.) An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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