an alternative spelling of catalogue. There are examples from 16c., but in modern times it seems to have emerged late 19c. (Century Dictionary, 1895, describes it as "a recent spelling"), but it was used earlier in German.
he found it in the Sears catalog
it does not pretend to be a catalog of his achievements
catafalque
Catalan
catalectic
catalepsy
cataleptic
catalog
catalogue
Catalonian
catalpa
catalyse
catalysis
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