\Pal`u*di"na\, n.; pl. L. {Paludin[ae]}, E.
{Paludinas}. [NL., fr. L. palus, -udis, a marsh, pool.]
(Zo["o]l.)
Any one of numerous species of freshwater pectinibranchiate
mollusks, belonging to {Paludina}, {Melantho}, and allied
genera. They have an operculated shell which is usually
green, often with brown bands. See Illust. of {Pond snail},
under {Pond}.