/ Dictionary / Index I isallobar: Meaning and Definition of Find definitions for: is•al•lo•bar Pronunciation: (ī-sal'u-bär"), [key] — n. Meteorol. a line on a weather map or chart connecting points having equal pressure changes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Isaian isallotherm 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