a bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants
"To give offense in any sense," he began sensibly, only to finish with "lox are a very metaphysical bird, it's heard."
—
The End of The Matter
Meanwhile, the lox was being steadily devalued, there was open hostility between the Jovians and Pax vessels which arrived at Callisto Station, and the aresians were complaining of being treated like poor cousins.
—
A King of Infinite Space
Lunar aluminum replaced liquid oxygen as standard for the lox (although the name remained the same).
—
A King of Infinite Space