Noun
The act of making dissimilar.
Source: Webster's dictionarythe Old French MARBRE became the English MARBLE by dissimilation Source: Internet
15 The Mongolian forms "may suggest an original proto-form" /lʲadi/ or /ladi/ "with dissimilation or metathesis in" Proto-Mongolic (Starostin et al. 2003:224). Source: Internet
This comes about by analogy with "January" (which ends in "-uary" but not "-ruary"), as well as by a dissimilation effect whereby having two "r"s close to each other causes one to change for ease of pronunciation. Source: Internet