/ Dictionary / Index I isothere: Meaning and Definition of Find definitions for: i•so•there Pronunciation: (ī'su-thēr"), [key] — n. Climatol. a line on a weather map or chart connecting points that have the same mean summer temperature. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isotactic isotherm Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language