/ Dictionary / Index L linebreeding: Meaning and Definition of Find definitions for: line•breed•ing Pronunciation: (līn'brē"ding), [key] — n. Genetics. a form of inbreeding directed toward keeping the offspring closely related to a superior ancestor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. linebred line-casting Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language