/ul"treuh/ , adj.
1. going beyond what is usual or ordinary; excessive; extreme.
n.
2. an extremist, as in politics, religion, fashion, etc.
3. ( cap. ) Mil. the British code name for intelligence gathered by decrypting German wireless communications enciphered on the Enigma machine during World War II.
[ independent use of ULTRA-, or shortening of words prefixed with it ]