Etymology
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septic (adj.)

c. 1600, "of or pertaining to sepsis; putrefaction, putrefying," from Latin septicus "of or pertaining to putrefaction," from Greek sēptikos "characterized by putrefaction," from sēptos, verbal adjective of sēpein "make rotten or putrid, cause to rot" (see sepsis). In modern use especially of infections or diseases caused by putrefaction.  Septic tank is attested from 1902.

updated on May 14, 2022

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Definitions of septic from WordNet

septic (adj.)
containing or resulting from disease-causing organisms;
septic sewage
a septic environment
a septic sore throat
Synonyms: infected
septic (adj.)
of or relating to or caused by putrefaction;
the septic action occurs at the bottom of the septic tank
From wordnet.princeton.edu, not affiliated with etymonline.