un·dé adjective orun·dée\ˈəndā\; oron·dé\ōⁿˈdā\; oron·dy\ˈändē\; orun·dy\ˈəndē\ Etymology: Anglo-French undé & undee (feminine of undé), from Old French unde, onde wave (from Latin unda) + -é (from Latin -atus -ate) — more at water : waving, wavy — used of division lines