v. i. [ Of imitative origin; cf. D. sissen, G. zischen. ] To make a hissing sound;
n. A hissing noise. [ Colloq. U. S. ] [ 1913 Webster ]
n. [ Hind. sīs&unr_;. ] (Bot.) A leguminous tree (Dalbergia Sissoo) of the northern parts of India; also, the dark brown compact and durable timber obtained from it. It is used in shipbuilding and for gun carriages, railway ties, etc. [ 1913 Webster ]