/ Dictionary / Index L linac: Meaning and Definition of Find definitions for: lin•ac Pronunciation: (lin'ak), [key] — n. Physics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: linac (Thesaurus) Lina Linacre Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language