Wa″ter snail′ (?). 1. (Zoöl.) Any aquatic pulmonate gastropod belonging to Planorbis, Limnæa, and allied genera; a pond snail.
2. (Mech.) The Archimedean screw.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.