Medical Dictionary

atmosphere at·mos·phere (āt'mə-sfǐr')

  1. A gas surrounding a given body; a gaseous medium.

  2. Abbr. atm, atm. A unit of pressure equal to the air pressure at sea level, approximately equal to 1.01325 × 105 newtons per square meter.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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