/ Dictionary / Index I isallotherm: Meaning and Definition of Find definitions for: is•al•lo•therm Pronunciation: (ī-sal'u-thûrm"), [key] — n. Meteorol. a line on a weather map or chart connecting points having equal temperature variations within a given period of time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isallobar isandrous 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