Source : Webster's Revised Unabridged Dictionary (1913)

Sandalwood \San"dal*wood\, n. [F. sandal, santal, fr. Ar.
   [,c]andal, or Gr. sa`ntalon; both ultimately fr. Skr.
   candana. Cf. {Sanders}.] (Bot.)
   (a) The highly perfumed yellowish heartwood of an East Indian
       and Polynesian tree ({Santalum album}), and of several
       other trees of the same genus, as the Hawaiian {Santalum
       Freycinetianum} and {S. pyrularium}, the Australian {S.
       latifolium}, etc. The name is extended to several other
       kinds of fragrant wood.
   (b) Any tree of the genus {Santalum}, or a tree which yields
       sandalwood.
   (c) The red wood of a kind of buckthorn, used in Russia for
       dyeing leather ({Rhamnus Dahuricus}).

   {False sandalwood}, the fragrant wood of several trees not of
      the genus {Santalum}, as {Ximenia Americana}, {Myoporum
      tenuifolium} of Tahiti.

   {Red sandalwood}, a heavy, dark red dyewood, being the
      heartwood of two leguminous trees of India ({Pterocarpus
      santalinus}, and {Adenanthera pavonina}); -- called also
      {red sanderswood}, {sanders} or {saunders}, and
      {rubywood}.

Redwood \Red"wood`\ (-w[oo^]d`), n. (Bot.)
   (a) A gigantic coniferous tree ({Sequoia sempervirens}) of
       California, and its light and durable reddish timber. See
       {Sequoia}.
   (b) An East Indian dyewood, obtained from {Pterocarpus
       santalinus}, {C[ae]salpinia Sappan}, and several other
       trees.

   Note: The redwood of Andaman is {Pterocarpus dalbergioides};
         that of some parts of tropical America, several species
         of {Erythoxylum}; that of Brazil, the species of
         {Humirium}.

Source : WordNet®

Pterocarpus santalinus
     n : tree of India and East Indies yielding a hard fragrant
         timber prized for cabinetwork and dark red heartwood used
         as a dyewood [syn: {red sandalwood}, {red sanders}, {red
         sanderswood}, {red saunders}]