Naoi·se (n??s?, n??-)n. The husband of Deirdre in Irish legend.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.Naoise (?ni???) n (European Myth & Legend) Irish myth the husband of Deirdre, killed by his uncle Conchobar. See also DeirdreCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014