[1] : The Collaborative International Dictionary of English v.0.48

sago \sa"go\ s=a"g-o, n. malay. s=agu.
   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..
   1913 webster

   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.
      1913 webster
see also:
metroxylon sagu cycas revoluta zamia integrifolia portland sago arum maculatum sago palm 
sago spleen 

[2] : WordNet (r) 2.0

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

Sago >> S Words
Sago, definition of term: Sago
sago_pag1.html

Sago Palm >> S Words
Sago Palm, definition of term: Sago Palm
sago+palm_pag1.html