Disasimilation or Disassimilation: How To spell?
The word Disasimilation is misspelled against Disassimilation, a noun meaning "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."
Disassimilation has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings disa & imilation which should not be misspelled with single 'S'
Wrong Spelling:  disa-s-imilation  Correct Spelling:  disa-ss-imilation 
Find more incorrect spellings of Disassimilation to spell right way.