/ Dictionary / Index I isoline: Meaning and Definition of Find definitions for: i•so•line Pronunciation: (ī'su-līn"), [key] — n. Meteorol., Geog. isogram. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isoleucine isologous Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language