GNU Collaborative International Dictionary of English

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1.       
   Disassimilation (?), 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; -- now more commonly called catabolism.
   
   [1913 Webster +PJC]
   
   The breaking down of already existing chemical compounds into simpler ones, sometimes called disassimilation. Martin.
   
   [1913 Webster]