/ Dictionary / Index I isopachous: Meaning and Definition of Find definitions for: i•so•pach•ous Pronunciation: (ī"su-pak'us, ī-sop'u-kus), [key] — adj. Geol. having the same thickness. of or pertaining to an isopach. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. isopach isopag Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language