Source : Webster's Revised Unabridged Dictionary (1913)

Ultra \Ul"tra\, a. [See {Ultra-}.]
   Going beyond others, or beyond due limit; extreme; fanatical;
   uncompromising; as, an ultra reformer; ultra measures.

Ultra \Ul"tra\, n.
   One who advocates extreme measures; an ultraist; an
   extremist; a radical. --Brougham.

Source : WordNet®

ultra
     adj : (used of opinions and actions) far beyond the norm;
           "extremist political views"; "radical opinions on
           education"; "an ultra conservative" [syn: {extremist},
           {radical}]