\Ul"tra-\, a.
A prefix from the Latin ultra beyond (see {Ulterior}), having
in composition the signification beyond, on the other side,
chiefly when joined with words expressing relations of place;
as, ultramarine, ultramontane, ultramundane, ultratropical,
etc. In other relations it has the sense of excessively,
exceedingly, beyond what is common, natural, right, or
proper; as, ultraconservative; ultrademocratic,
ultradespotic, ultraliberal, ultraradical, etc.

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

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