Source : Webster's Revised Unabridged Dictionary (1913)

Sissoo \Sis*soo"\, n. [Hind. s[=i]s?.] (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.

Source : WordNet®

sissoo
     n : East Indian tree whose leaves are used for fodder; yields a
         compact dark brown durable timber used in shipbuilding
         and making railroad ties [syn: {sissu}, {sisham}, {Dalbergia
         sissoo}]