/ Dictionary / Index I isobront: Meaning and Definition of Find definitions for: i•so•bront Pronunciation: (ī'su-bront"), [key] — n. Meteorol. a line on a weather map or chart connecting various points where a given phase of thunderstorm activity occurred simultaneously. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isobathytherm isobutane 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