arrière-grand-onclecommon nounSyllable Decompositionarrière-grand-oncleEtymologyexpandderived from grand-uncle with the prefix arrière, by analogy with grandfather and great-grandfather.Definitions1. Brother of one of the great-grandparents. One is a great-grand-nephew or a great-grand-niece for their great-grand-uncle.expand2. Husband of a sister of one of the great-grandparents.expandFemininearrière-grand-tanteTranslationsenglish:great-great-uncle