ultra-

CIDE DICTIONARY

ultra-, 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.  [1913 Webster]

OXFORD DICTIONARY

ultra-, comb. form 1 beyond; on the other side of (opp. CIS-).
2 extreme(ly), excessive(ly) (ultra-conservative; ultra-modern).

Etymology

L ultra beyond