/ Dictionary / Index A atmolysis: Meaning and Definition of Find definitions for: at•mol•y•sis Pronunciation: (at-mol'u-sis), [key] — pl. -ses a process for separating gases or vapors of different molecular weights by transmission through a porous substance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. atmo- atmometer Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language