noun🔗ShareAny of a group of conspicuous tropical marine fish of the family Chaetodontidae; the bannerfish and coralfish are also included in this group. Butterflyfish are fairly small, mostly from 12 to 22 cm (c.7-9 in) in length."While snorkeling in Hawaii, we saw several brightly colored butterflyfish swimming around the coral. "fishanimalorganismbiologyoceannatureenvironmentChat with AIVocabulary GamePractice Reading