pneumogram
/ˈnjuːmə(ʊ)ɡram/Medicine
noun
1A tracing made by a pneumograph; a graphic record of respiration. In later use also: an instrument for monitoring respiratory activity; an examination with such an instrument.
2An X-ray made by pneumography. Now rare.
Origin
Late 19th century; earliest use found in The Lancet. From pneumo- + -gram, after pneumograph or pneumography.