uncle-in-law in English dictionary uncle-in-law Meanings and definitions of "uncle-in-law" noun (nonstandard) The husband of one's aunt. noun (nonstandard) The uncle of one's spouse. more Grammar and declension of uncle-in-law uncle-in-law (plural uncles-in-law) more Sample sentences with "uncle-in-law" Declension Stem Try again Available translations Catalan Esperanto German Japanese Polish Portuguese Spanish Authors