Hypertext Webster Gateway: "Valvata"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Valvata \Val*va"ta\, n. [NL.; cf. L. valvatus having folding
doors. See {Valve}.] (Zo["o]l.)
A genus of small spiral fresh-water gastropods having an
operculum.
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