noun, plural vermin.
noxious, objectionable, or disgusting animals collectively, especially those of small size that appear commonly and are difficult to control, as flies, lice, bedbugs, cockroaches, mice, and rats.
an objectionable or obnoxious person, or such persons collectively.
animals that prey upon game, as coyotes or weasels.

1300–50; Middle English vermyne < Anglo-French, Middle French vermin, vermine < Vulgar Latin *verminum, *vermina, based on Latin vermin-; see verminate Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vermin (ˈvɜːmɪn)
n , -min
1.  (functioning as plural) small animals collectively, esp insects and rodents, that are troublesome to man, domestic animals, etc
2.  an unpleasant, obnoxious, or dangerous person
[C13: from Old French vermine, from Latin vermis a worm]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1300, "noxious animals," from Anglo-Fr. and O.Fr. vermin, from V.L. *verminum "vermin," possibly including bothersome insects, collective noun formed from L. vermis "worm" (see worm). Extended to "low, obnoxious people" by 1562.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

vermin ver·min (vûr'mĭn)
n. pl. vermin
Any of various small animals or insects, such as rats or cockroaches, that are destructive, annoying, or injurious to health.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Her bones had been gnawed by animals, and the remaining bits of unwanted flesh and clothing were scattered by storms and vermin.
It's also important to clean up dead insects or dead vermin, which can be a source of food for vermin.
The primary line of defense against mice and other vermin is to prevent them
  from getting in in the first place.
It often stinks, attracts vermin and creates eyesores.
Image for vermin
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