septic (adj.)youdaoicibaDictYouDict[septic 词源字典]
c. 1600, from Latin septicus "of or pertaining to putrefaction," from Greek septikos "characterized by putrefaction," from sepein "make rotten or putrid, cause to rot" (see sepsis). Septic tank is attested from 1902.[septic etymology, septic origin, 英语词源]