World English Dictionary
lemming (ˈlɛmɪŋ)
1.  any of various volelike rodents of the genus Lemmus and related genera, of northern and arctic regions of Europe, Asia, and North America: family Cricetidae. The Scandinavian variety, Lemmus lemmus, migrates periodically when its population reaches a peak
2.  a member of any large group following an unthinking course towards mass destruction
[C17: from Norwegian; related to Latin latrāre to bark]

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