WordWeb Online

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, septicaemic [Brit, Cdn], septicemic [N. Amer], unhealthful

Encyclopedia: Septic