dissimilation

dissimilation

[dih-sim-uh-ley-shuhn]
noun
1.
the act of making or becoming unlike.
2.
Phonetics. the process by which a speech sound becomes different from or less like a neighboring sound, as pilgrim [pil-grim] from Latin peregrīnus [per-e-gree-noos] and purple [pur-puhl] from Old English purpure [poor-poo-re] or disappears entirely because of a like sound in another syllable, as in the pronunciation [guhv-uh-ner] for governor. Compare assimilation ( def 5 ).
3.
Biology, catabolism.

Origin:
1820–30; dis-1 + (as)similation

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World English Dictionary
dissimilation (ˌdɪsɪmɪˈleɪʃən)
 
n
1.  the act or an instance of making dissimilar
2.  phonetics the alteration or omission of a consonant as a result of being dissimilated
3.  biology a less common word for catabolism

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