Simple past tense and past participle of hiss. (verb)
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Use "hissed" in a sentence
"Said-Bookisms That Are Usually Safe asked lied admitted snapped declared accused replied (even though it should be obvious) exclaimed roared yelled speculated mused demanded whispered asserted countered cut in hissed (this sticks out a lot, though … use it very sparingly) barked (this also sticks out)"
"A long sigh of steam hissed from the logs burning in the five-foot-high fireplace as I entered the living room."
""Raistlin," the name hissed softly from Par-Salian's lips."