/ Dictionary / Index P pure line: Meaning and Definition of Find definitions for: pure' line' Pronunciation: [key] — Genetics. Genetics. a uniform strain of organisms that is relatively pure genetically because of continued inbreeding and artificial selection. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Pure Land purely Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language