Etymology
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vermin (n.)

c. 1300, "noxious animals," from Anglo-French and Old French vermin "moth, worm, mite," in plural "troublesome creatures" (12c.), from Vulgar Latin *verminum "vermin," possibly including bothersome insects, collective noun formed from Latin vermis "worm" (from PIE root *wer- (2) "to turn, bend"). Extended to "low, obnoxious people" by 1560s.

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Definitions of vermin

vermin (n.)
an irritating or obnoxious person;
Synonyms: varmint
vermin (n.)
any of various small animals or insects that are pests; e.g. cockroaches or rats;
he examined the child's head for vermin
cereals must be protected from mice and other vermin
boys in the village have probably been shooting vermin
From wordnet.princeton.edu