SG Heritage Dictionary

Siss [Verb intransitive] Webster's Dictionary 1828

To hiss; a legitimate word in universal popular use in New England.

Siss [Noun] Webster's Dictionary 1913

Siss [Verb intransitive] Webster's Dictionary 1913

To make a hissing sound; as, a flatiron hot enough to siss when touched with a wet finger.

Sissoo [Noun] Webster's Dictionary 1913

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.