8 letters · 17 points in Scrabble
noun a measuring instrument that measures the oxygen in arterial blood
originFrom oxi- (variant of oxy-) + -meter. The word was first applied in sense 2 (“a device that measures the oxygen saturation of arterial blood”) by American physiologist Glenn Allan Millikan (1906–1947).
Etymology from Wiktionary, CC BY-SA 3.0