资料来源 : pyDict

水

资料来源 : Webster's Revised Unabridged Dictionary (1913)

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.