'Hydrachnid' definitions:
Definition of '
Hydrachnid
'
From:
GCIDE
Hydrachnid \Hy*drach"nid\, n. [Hydr- + arachnid.] (Zool.) An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels. [1913 Webster]
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