| a. | 1. | (Math.) Of the seventh degree or order. |
| 1. | Having power to promote putrefaction. | |
| n. | 1. | A substance that promotes putrefaction. |
| Adj. | 1. | septic - containing or resulting from disease-causing organisms; "a septic sore throat"; "a septic environment"; "septic sewage" Antonyms: antiseptic - thoroughly clean and free of or destructive to disease-causing organisms; "doctors in antiseptic green coats"; "the antiseptic effect of alcohol"; "it is said that marjoram has antiseptic qualities" |
| 2. | septic - of or relating to or caused by putrefaction; "the septic action occurs at the bottom of the septic tank" |