Dictionaryat•mol•y•sisPronunciation: (at-mol'u-sis), [key] —n., —pl. -sesPronunciation: (-sēz"). [key] 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.
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