n. destructive metabolism, usually including the release of energy and breakdown of materials
the GNU version of the Collaborative International Dictionary of English
n. the breakdown of more complex substances into simpler ones with release of energy, in living organisms; destructive or downward metabolism; -- a form of metabolism, opposed to anabolism. See also disassimilation.
The Century Dictionary and Cyclopedia
n. In physiology, that phase of metabolism which consists in “a downward series of changes in which complex bodies are broken down with the setting free of energy into simpler and simpler waste bodies” (M. Foster): opposed to anabolism.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. breakdown in living organisms of more complex substances into simpler ones together with release of energy
Word Usage
"NOT getting enough protein is a sure way to destroy muscle and promote catabolism, which is obviously detrimental to any type of fitness program or goal."