/ Dictionary / Index X x-line: Meaning and Definition of Find definitions for: x-line Pronunciation: (eks'līn"), [key] — n. Print. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. XL X-linked Related Content Daily Word Quiz: mongrel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language