Word Study
assibilate
CIDE DICTIONARY
assibilate, v. t. [L. assibilatus, p. p. of assibilare to hiss out; ad + sibilare to hiss.].
To make sibilant; to change to a sibilant. J. Peile. [1913 Webster]
OXFORD DICTIONARY
assibilate, v.tr. Phonet.
1 pronounce (a sound) as a sibilant or affricate ending in a sibilant.
2 alter (a syllable) to become this.
1 pronounce (a sound) as a sibilant or affricate ending in a sibilant.
2 alter (a syllable) to become this.
Derivative
assibilation n.
Etymology
L assibilare (as AD-, sibilare hiss)
For further exploring for "assibilate" in Webster Dictionary Online