Definition of "vet"

vet¹

/vɛt/

noun
plural vets
1. (colloquial) A veterinarian or veterinary surgeon.
  Quotations
  Colin Cameron, a vet who examined the dead animal, said there was "no doubt the kitten would have suffered unnecessarily" before dying.
  2011 December 14, Steven Morris, “Devon woman jailed for 168 days for killing kitten in microwave”, in Guardian‎

vet²

/vɛt/

noun
plural vets
1. (colloquial, US) A veteran (a former soldier or other member of armed forces).
  Quotations
  “A former soldier, sir. A vet. Theyʼre all vets, a little shellshocked.”
  1952, Ralph Ellison, Invisible Man, Penguin Books (2014), page 73

vet³

/vɛt/

verb
third-person singular simple present vets, present participle vetting, simple past and past participle vetted
1. To thoroughly check or investigate particularly with regard to providing formal approval.