Sis·soo n.  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.
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  Dalbergia 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: sissoo, sissu, sisham]