From Longman Dictionary of Contemporary Englishtopknottop‧knot /ˈtɒpnɒt $ ˈtɑːpnɑːt/ noun [countable] DChair that is tied together on top of your head
Examples from the Corpus
topknot• His head was shaven but for a topknot.• Hair formed either a halo or a topknot, instead of falling into whatever style a woman wished it might.• Only a bold topknot of dry leaves thrust from his crown, grey-green and jagged.• He cut off his topknot, wore his hair in the short Western style, and grew a trim mustache.• To a Clinton outfitted in topknot and kimono.• He stared at the topknot of red-gold curls, straining to remember.• His mates laughed, and helped him tie the topknot. 