'lav' definitions:

Definition of 'lav'

From: WordNet
noun
A room or building equipped with one or more toilets [syn: toilet, lavatory, lav, can, john, privy, bathroom]

Definition of 'lav'

From: GCIDE
  • lav \lav\ n. [by truncation of lavatory.] Same as lavatory[5]; -- a shortened form of the word. [informal]
  • Syn: toilet, lavatory, can, facility, john, privy, bathroom. [WordNet 1.5]