1. (n.)vermin noxious or objectionable animals collectively, esp. those of smallsize that appear commonly and are difficult to control, as flies, lice, cockroaches, and rats.
2. vermin an objectionable or obnoxious person, or such persons collectively.
3. vermin animals that prey upon game, as coyotes.
Etymology: (1300–50; < MF vermin(e) < L vermināre to be infested with maggots, to have racking pains)
Definition of 'vermin'
Princeton's WordNet
1. (noun)vermin, varmint an irritating or obnoxious person
2. (noun)vermin any of various small animals or insects that are pests; e.g. cockroaches or rats "cereals must be protected from mice and other vermin"; "he examined the child's head for vermin"; "boys in the village have probably been shooting vermin"
2. vermin a noxious or mischievous animal; especially, noxious little animals or insects, collectively, as squirrels, rats, mice, flies, lice, bugs, etc
3. vermin hence, in contempt, noxious human beings
Sense: undesirable or troublesome pests such as fleas, rats, or mice Farmers are always having trouble with various types of vermin; It is vermin such as these men that are trying to destroy society.