Etymology
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lox (n.)

1934, American English, from Yiddish laks, from Middle High German lahs "salmon," from Proto-Germanic *lakhs-, from the common IE root for the fish, *laks- (source also of Lithuanian lašiša, Russian losos, Polish łosoś "salmon").

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Definitions of lox

lox (n.)
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;
Synonyms: liquid oxygen
lox (n.)
brine-cured salmon that is lightly smoked;
From wordnet.princeton.edu