Source : Webster's Revised Unabridged Dictionary (1913)

Agar-agar \A`gar-a"gar\, n.
   A gelatinlike substance, or a solution of it, prepared from
   certain seaweeds containing gelose, and used in the
   artificial cultivation of bacteria; -- often called {agar},
   by abbreviation.

Agar-agar \A`gar-a"gar\, n. [Ceylonese local name.]
   A fucus or seaweed much used in the East for soups and
   jellies; Ceylon moss ({Gracilaria lichenoides}).

Source : WordNet®

agar-agar
     n : a colloidal extract of algae; used especially in culture
         media and as a gelling agent in foods [syn: {agar}]