septic

from The American Heritage® Dictionary of the English Language, 5th Edition.

• adjective Of, relating to, having the nature of, or affected by sepsis.
• adjective Causing sepsis; putrefactive.

from The Century Dictionary.

• Of or pertaining to sepsis in general; putrefactive or putrefying; septical: opposed to antiseptic.
• noun A substance which causes sepsis.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Math.) Of the seventh degree or order.
• noun A substance that promotes putrefaction.
• adjective Having power to promote putrefaction.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mathematics A mathematical object (function, curve, surface, etc.) of degree seven.
• adjective Of or pertaining to sepsis.
• adjective Causing sepsis or putrefaction.
• adjective Of or pertaining to sewage or the disposal of sewage.
• noun A substance that causes sepsis or putrefaction.
• noun A septic tank; a system for the disposal of sewage into a septic tank, a septic system.
• noun UK, Australia, New Zealand, rhyming slang An American, a Yank.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective of or relating to or caused by putrefaction
• adjective containing or resulting from disease-causing organisms