A large bag in which expired gas is collected for several minutes to determine oxygen consumption in humans under conditions of actual work. ... Origin: C.G. Douglas ... (05 Mar 2000) ... 
(dug´lәs) a receptacle for the collection of exhaled air, permitting measurement of respiratory gases; typically used to measure dead space to tidal volume ratio (VD/VT).
Type: Term Pronunciation: dŭg′lăs Definitions: 1. a large bag in which expired gas is collected for several minutes to determine oxygen consumption in humans under conditions of actual work.
an airtight bag used to collect expired air for analysis of oxygen consumption.