Source : Webster's Revised Unabridged Dictionary (1913)

Raca \Ra"ca\, a. [Gr. ?, from Chaldee r[=e]k[=a].]
   A term of reproach used by the Jews of our Savior's time,
   meaning ``worthless.''

         Whosoever shall say to his brother, Raca, shall be in
         danger of the council.                   --Matt. v. 22.