Search Result for "lemming": 
Wordnet 3.0

NOUN (1)

1. any of various short-tailed furry-footed rodents of circumpolar distribution;


The Collaborative International Dictionary of English v.0.48:

Lemming \Lem"ming\ (l[e^]m"m[i^]ng), n. [Nor. lemming, lemende; cf. Sw. lemel, Lapp. lummik.] (Zool.) Any one of several species of small arctic rodents of the genera Myodes and Cuniculus, resembling the meadow mice in form. They are found in both hemispheres. [1913 Webster] Note: The common Northern European lemming (Myodes lemmus) is remarkable for making occasional devastating migrations in enormous numbers from the mountains into the lowlands. [1913 Webster]
WordNet (r) 3.0 (2006):

lemming n 1: any of various short-tailed furry-footed rodents of circumpolar distribution