Dis`as*sim`i*la"tion\, n. (Physics) 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.

The breaking down of already existing chemical compounds into simpler ones, sometimes called disassimilation. --Martin.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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