topknotPronunciation: /ˈtɒpnɒt/Definition of topknot noun a knot of hair arranged on the top of the head. a decorative knot or bow of ribbon worn on the top of the head, popular in the 18th century. (in an animal or bird) a tuft or crest of hair or feathers. topknot in other Oxford dictionaries Definition of topknot in the US English dictionary