An uncle of one's parent; also called a great-uncle.
From 'grand' (great) + 'uncle' (from Old French 'oncle,' Latin 'avunculus'). The term follows the naming convention for extended family relationships.
Most people say 'great-uncle' instead of 'granduncle,' but both are correct—it's a reminder that 'grand' and 'great' were once used interchangeably to mean 'of a higher generation.'
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