Added 9 October 2026 fluttering noun Categories: ActionsRare Words noun ! Definition from WordNet 3.1, Princeton University. More about fluttering at Wordnik → Where our words come from → The motion made by flapping up and down. Related Words: flitteringflapflappingfloppingwavingaflareflaringmovingunsteadypalpitantflyingpalpitating Back to today's word