Source : Webster's Revised Unabridged Dictionary (1913)

Sago \Sa"go\ (s[=a]"g[-o]), n. [Malay. s[=a]gu.]
   A dry granulated starch imported from the East Indies, much
   used for making puddings and as an article of diet for the
   sick; also, as starch, for stiffening textile fabrics. It is
   prepared from the stems of several East Indian and Malayan
   palm trees, but chiefly from the {Metroxylon Sagu}; also from
   several cycadaceous plants ({Cycas revoluta}, {Zamia
   integrifolia}, etc.).

   {Portland sago}, a kind of sago prepared from the corms of
      the cuckoopint ({Arum maculatum}).

   {Sago palm}. (Bot.)
   (a) A palm tree which yields sago.
   (b) A species of Cycas ({Cycas revoluta}).

   {Sago spleen} (Med.), a morbid condition of the spleen,
      produced by amyloid degeneration of the organ, in which a
      cross section shows scattered gray translucent bodies
      looking like grains of sago.

Source : WordNet®

sago
     n : powdery starch from certain sago palms; used in Asia as a
         food thickener and textile stiffener