dissimilate
verb
dis·sim·i·late (ˌ)di-ˈsi-mə-ˌlāt 
dissimilated; dissimilating
intransitive verb
: to undergo dissimilation
dissimilatory
(ˌ)di-ˈsi-mə-lə-ˌtȯr-ē
adjective 
Word History
Etymology
dis- + -similate (as in assimilate)
First Known Use
1841, in the meaning defined above