Ra'ca (rā'kȧ) adjective [ Greek 'raka` , from Chaldee rēkā .] 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.... Found on http://www.encyclo.co.uk/webster/R/1