Eū/dĭ-òm/e-ter, n.

n. [Gr. εὐδία, fair, clear weather, from εὔδιος, fine, clear, of air, weather, from εὖ, well, good, and Ζεύς, genitive Διός, Jupiter, Jove, as ruling in the lower air, and μέτρον, measure; Fr. eudiomètre.] An instrument for ascertaining the purity of the air, or rather the quantity of oxygen contained in any given bulk of elastic fluid. Ure.