ˌyüdēˈäməd.ə(r) noun
Etymology: Italian eudiometro, from eudio- (from Greek eudia fair weather, from eu- + -dia weather — akin to Latin dies day) + -metro -meter; from a former belief that the proportion of oxygen in the air is higher in fair than in bad weather — more at deity
: an instrument (as a graduated glass tube) for the volumetric measurement and analysis of gases that involves the explosion of one of the components of a mixture by the passage of an electric spark — compare burette 1
• eu·di·o·met·ric |yüdēə|me.trik adjective