respirometer
noun
res·pi·rom·e·ter ˌre-spə-ˈrä-mə-tər 
: an instrument for studying the character and extent of respiration
respirometric
ˌre-spə-rō-ˈme-trik
adjective respirometry
ˌre-spə-ˈrä-mə-trē
noun 
Example Sentences
Recent Examples on the Web The team figured this out by placing muscle tissue from 21 captive and wild sea otters inside a device called a respirometer that researchers used to measure how much oxygen the muscle cells were using. 
Alex Fox, Smithsonian Magazine, 13 July 2021
Alex Fox, Smithsonian Magazine, 13 July 2021 Word History
First Known Use
circa 1883, in the meaning defined above
Medical Definition
respirometer
noun
res·pi·rom·e·ter ˌres-pə-ˈräm-ət-ər
: an instrument for studying the character and extent of respiration