from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To pronounce with a hissing sound; make sibilant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To change into or pronounce with the accompaniment of a sibilant sound or sounds.
  • v. To change by assibilation.

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To make sibilant; to change to a sibilant.

from The Century Dictionary and Cyclopedia

  • To render sibilant, as a sound; change into a sibilant or hissing sound; alter, as a sound, by the phonetic process called assibilation.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. insert a sibilant sound before or after (another sound)
  • v. change into a sibilant


ad- + sibilate.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin assībilātus ("murmured, whispered at, hissed"), past participle of assībilō ("hiss at", v), from ad ("at") + sībilō ("hiss", v), from sībilus ("a hissing, whistling"), of imitative origin. (Wiktionary)



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