a cap of loose net, as of silk or nylon, for holding the hair in place.
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How to use hair net in a sentence
British Dictionary definitions for hairnet
any of several kinds of light netting worn over the hair to keep it in place
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012