/ Dictionary / Index I isopterous: Meaning and Definition of Find definitions for: i•sop•ter•ous Pronunciation: (ī-sop'tur-us), [key] — adj. belonging or pertaining to social insects of the order Isoptera, comprising the termites. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isoproterenol isopycnic 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