The noun is derived from Middle English holocaust, from Anglo-Norman holocauste, Old French holocauste, olocauste (modern French holocaust), from Late Latin holocaustum, from Ancient Greek ὁλόκαυστον, the neuter form of ὁλόκαυστος, from ὅλος (ultimately from Proto-Indo-European *solh₂-) + καυστός (from καίω; further etymology uncertain, possibly from Proto-Indo-European *keh₂w-).
The verb is derived from the noun. As regards verb sense 3 (“to subject (a group of people) to a holocaust”), compare the use of genocide as a verb.
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