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Douglas bag

noun
1.
an airtight bag used to collect expired air for analysis of oxygen consumption.
Origin
1960-1965
1960-65; named after Claude G. Douglas (1882-1963), British physiologist
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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douglas-bag in Medicine

Douglas bag Doug·las bag (dŭg'ləs)
n.
A receptacle for collecting expired air to determine oxygen consumption in humans under various work conditions.

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