verb (v)

• become dissimilar by changing the sound qualities(verb.change)

  Example:
  These consonants dissimilate.
  

  source: wordnet30
• make dissimilar; cause to become less similar(verb.change)

  source: wordnet30
• become dissimilar or less similar(verb.change)

  Example:
  These two related tribes of people gradually dissimilated over time.
  

  Antonym:
  assimilate
  

  source: wordnet30
• To render dissimilar.(verb)

  source: webster1913