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Latin word puritas comes from Proto-Indo-European *pu-, Proto-Indo-European *pow-, and later Latin purus (Clean; pure. Clear, limpid.)
*pu- (Proto-Indo-European)
*pow- (Proto-Indo-European)
purus (Latin)
Clean; pure. Clear, limpid.
pur (Old French)
Pure.
pur (French)
Pure (undiluted). Pure (unspoilt).
puritas (Latin)
(post-classical) Purity.