from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The decomposition of complex substances, within an organism, into simpler ones suitable only for excretion, with the release of energy; a normal nutritional process that is the reverse of assimilation.
from the GNU version of the Collaborative International Dictionary of English
- n. The decomposition of complex substances, within the organism, into simpler ones suitable only for excretion, with evolution of energy, -- a normal nutritional process the reverse of assimilation; downward metabolism; -- now more commonly called catabolism.
from The Century Dictionary and Cyclopedia
- n. The opposite of assimilation; specifically, the same as retrograde metamorphosis (which see, under metamorphosis) or catabolism.
dis- + assimilation? (Wiktionary)