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1732, a back-formation from putrescence, or else from Latin putrescentem (nominative putrescens), present participle of putrescere "grow rotten, moulder, decay," inchoative of putrere "be rotten" (see putrid).
putrescent pu·tres·cent (pyōō-trěs'ənt)
Becoming putrid; putrefying.
Of or relating to putrefaction.