adj. Of or pertaining to sepsis.adj. Causing sepsis or putrefaction.adj. Of or pertaining to sewage or the disposal of sewage.n. A substance that causes sepsis or putrefaction.n. A septic tank; a system for the disposal of sewage into a septic tank, a septic system.n. A mathematical object (function, curve, surface, etc.) of degree seven.n. An American, a Yank.