liquid oxygen

noun

1. a clear, pale blue liquid obtained by compressing oxygen and then cooling it below its boiling point: used chiefly as an oxidizer in liquid rocket propellants.

liquid oxygen

noun

1. Also called: lox. the clear pale blue liquid state of oxygen produced by liquefying air and allowing the nitrogen to evaporate: used in rocket fuels

Word History and Origins

Origin of liquid oxygen¹

First recorded in 1875–80