Putrid

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late Middle English: from Latin putridus, from putrere ‘to rot’, from puter, putr- ‘rotten’.

wiktionary

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From Middle English, borrowed from Old French putride or directly from Latin putridus(“rotten, decayed”), from putreō(“I am rotten or putrid”), from puter(“rotten, decaying, putrid”).

etymonline

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putrid (adj.)

late 14c., "festering gangrenous, in a state of decay," from Old French putride and directly from Latin putridus, from putrere "to rot," from putris "rotten, crumbling," related to putere "to stink," from PIE root *pu- (2) "to rot, stink" (see pus). First in reference to putrid fever, an old name for typhus (also known in Middle English as putrida), which supposedly was caused by putrefaction of bodily humors. Related: Putridness.