资料来源 : Webster's Revised Unabridged Dictionary (1913)

Disassimilation \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.