Pronunciation: (lem'u-tīz"), [key]
—v.t., -tized, -tiz•ing.
to sort (the words in a list or text) in order to determine the headword, under which other words are then listed. Also, esp. Brit.,lem'ma•tise".
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.