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From The Collaborative International Dictionary of English v.0.48:
Vermin \Ver"min\, n. sing. & pl.; used chiefly as plural. [OE. vermine, F. vermine, from L. vermis a worm; cf. LL. vermen a worm, L. verminosus full of worms. See Vermicular, Worm.] 1. An animal, in general. [Obs.] [1913 Webster] Wherein were all manner of fourfooted beasts of the earth, and vermin, and worms, and fowls. --Acts x. 12. (Geneva Bible). [1913 Webster] This crocodile is a mischievous fourfooted beast, a dangerous vermin, used to both elements. --Holland. [1913 Webster] 2. A noxious or mischievous animal; especially, noxious little animals or insects, collectively, as squirrels, rats, mice, worms, flies, lice, bugs, etc. "Cruel hounds or some foul vermin." --Chaucer. [1913 Webster] Great injuries these vermin, mice and rats, do in the field. --Mortimer. [1913 Webster] They disdain such vermin when the mighty boar of the forest . . . is before them. --Burke. [1913 Webster] 3. Hence, in contempt, noxious human beings. [1913 Webster] You are my prisoners, base vermin. --Hudibras. [1913 Webster]