'Son-in-law' definitions:

Definition of 'son-in-law'

From: WordNet
noun
The husband of your daughter

Definition of 'Son-in-law'

From: GCIDE
  • Son-in-law \Son"-in-law`\, n.; pl. Sons-in-law. The husband of one's daughter; a man in his relationship to his wife's parents. [1913 Webster]
  • To take me as for thy son in lawe. --Chaucer. [1913 Webster]