From WordNet (r) 3.0 (2006):
hiss
n 1: a fricative sound (especially as an expression of
disapproval); "the performers could not be heard over the
hissing of the audience" [syn: hiss, hissing,
hushing, fizzle, sibilation]
2: a cry or noise made to express displeasure or contempt [syn:
boo, hoot, Bronx cheer, hiss, raspberry, razzing,
razz, snort, bird]
v 1: make a sharp hissing sound, as if to show disapproval [syn:
hiss, siss, sizz, sibilate]
2: move with a whooshing sound [syn: hiss, whoosh]
3: express or utter with a hiss [syn: hiss, sizz, siss,
sibilate]
4: show displeasure, as after a performance or speech [syn:
boo, hiss] [ant: acclaim, applaud, clap, spat]