/ Dictionary / Index I isogram: Meaning and Definition of Find definitions for: i•so•gram Pronunciation: (ī'su-gram"), [key] — n. Meteorol., Geog. a line representing equality with respect to a given variable, used to relate points on maps, charts, etc. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: isogram (Thesaurus) isograft isograph Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language