Krebs cycle

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

• noun A series of enzymatic reactions in aerobic organisms involving oxidative metabolism of acetyl units and producing high-energy phosphate compounds, which serve as the main source of cellular energy.

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

• noun biochemistry A series of enzymatic reactions that occurs in all aerobic organisms; it involves the oxidative metabolism of acetyl units, and serves as the main source of cellular energy.

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

• noun in all plants and animals: a series of enzymatic reactions in mitochondria involving oxidative metabolism of acetyl compounds to produce high-energy phosphate compounds that are the source of cellular energy