Meaning of ultra

ul•tra

Pronunciation: (ul'tru), [key]
— adj.
  1. going beyond what is usual or ordinary; excessive; extreme.
—n.
  1. an extremist, as in politics, religion, fashion, etc.
  2. (cap.)the British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II.

ultra-

Pronunciation: [key]
  1. a prefix occurring originally in loanwords from Latin, with the basic meaning “on the far side of, beyond.” In relation to the base to which it is prefixed,has the senses “located beyond, on the far side of&hasp;” (ultramontane; ultraviolet), “carrying to the furthest degree possible, on the fringe of&hasp;” (ultraleft; ultramodern), “extremely” (ultralight); nouns to which it is added denote, in general, objects, properties, phenomena, etc., that surpass customary norms, or instruments designed to produce or deal with such things (ultramicroscope; ultrasound; ultrastructure).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
See also: