资料来源 : Webster's Revised Unabridged Dictionary (1913)

Assibilation \As*sib`i*la"tion\, n.
   Change of a non-sibilant letter to a sibilant, as of -tion to
   -shun, duke to ditch.

资料来源 : WordNet®

assibilation
     n 1: the development of a consonant phoneme into a sibilant
     2: pronunciation with a sibilant (hissing or whistling) sound
        [syn: {sibilation}]