lym·phad·e·ni·tis (l?m-f?d?n-??t?s, l?m?f?-d?-n??-)n. Inflammation of one or more lymph nodes.[lymph + aden(o)- + -itis.]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.lymphadenitis (l?m?fæd??na?t?s; ?l?mfæd-) n (Pathology) inflammation of a lymph node[C19: New Latin. See lymph, adenitis]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014lym?phad?e?ni?tis (l?m?fæd n?a? t?s) n. inflammation of a lymph node. Also called adenitis. [1875?80] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.