/ Dictionary / Index I isoperimeter: Meaning and Definition of Find definitions for: i•so•pe•rim•e•ter Pronunciation: (ī"sō-pu-rim'i-tur), [key] — n. Geom. a figure whose perimeter is equal to that of another. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isopentyl isoperimetry Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language