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Adjective: septic  sep-tik
  1. Containing or resulting from disease-causing organisms
    "a septic sore throat"; "septic sewage";
    - infected
  2. Of or relating to or caused by putrefaction
    "the septic action occurs at the bottom of the septic tank"

See also: abscessed, contaminative, dirty, germy, infectious, infective, pestiferous, purulent, pussy, putrefacient, putrefactive, septicemic, unhealthful

Antonym: antiseptic

Encyclopedia: Septic