Dictionary
lem•ma•tize
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.