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Meaning of lemming

lem•ming

Pronunciation: (lem'ing), [key]
— n.
  1. any of various small, mouselike rodents of the genera Lemmus, Myopus, and Dicrostonyx, of far northern regions, as L. lemmus, of Norway, Sweden, etc., noted for periodic mass migrations that sometimes result in mass drownings.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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