D defs.my
Entry 1 sense Webster, 1913

Sibilation

· Sib·i·la·tion · IPA
01 n. Utterance with a hissing sound; also, the sound itself; a hiss.
  1. 1.
    Utterance with a hissing sound; also, the sound itself; a hiss.
    “He, with a long, low sibilation, stared.” Tennyson.