One of the mysteries of the English language finally explained.
1Physical Chemistry. Sorption in which molecules of a gas enter pores in a solid that are only a little larger than themselves.
2Physiology and Medicine. The passage of a substance through the skin or a mucous membrane; specifically the passage of intact particulate material through the gastrointestinal mucosa.
1930s; earliest use found in James William McBain (b. 1882). From per- + sorption, after adsorption, absorption.
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