sibilate

• POS: Verb (usu participle)
• HYPHEN: sib=i=late

CIDE DICTIONARY

sibilate, v. t. & i. 

 To pronounce with a hissing sound, like that of the letter s; to mark with a character indicating such pronunciation.  [1913 Webster]

OXFORD DICTIONARY

sibilate, v.tr. & intr. pronounce with or utter a hissing sound.

Derivative

sibilation n.

THESAURUS

sibilate

assibilate, bark, bawl, bellow, blare, blat, blubber, boom, bray, breathe, buzz, cackle, chant, chirp, coo, crow, drawl, effervesce, exclaim, fizz, fizzle, flute, gasp, growl, grunt, hiss, hush, keen, lilt, lisp, mumble, murmur, mutter, pant, pipe, roar, rumble, scream, screech, shriek, shush, sigh, sing, siss, sizz, sizzle, snap, snarl, sneeze, sniff, sniffle, snore, snort, snuff, snuffle, sob, spit, splutter, sputter, squall, squash, squawk, squeal, squelch, squish, swish, thunder, trumpet, twang, wail, warble, wheeze, whine, whish, whisk, whisper, whistle, whiz, whoosh, yap, yawp, yell, yelp, zip