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Definition of Hydrachnid
1. n. An aquatic mite of the genus Hydrachna. The hydrachnids, while young, are parasitic on fresh-water mussels.
Definition of Hydrachnid
1. Noun. (zoology) An aquatic mite of the genus ''Hydrachna''. ¹
¹ Source: wiktionary.com
Medical Definition of Hydrachnid
1.