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say it: SEP-tik
septic is an adjective meaning "containing or resulting from disease-causing organisms". It carries 2 recorded senses.
containing or resulting from disease-causing organisms
“a septic sore throat”
“a septic environment”
“septic sewage”
of or relating to or caused by putrefaction
“the septic action occurs at the bottom of the septic tank”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for septic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.