ultra

中文： 极端分子、激进分子

1. A political extremist, in particular
2. An ultraleftist.
3. An ultranationalist.
4. An ultraroyalist.
5. An especially devoted football fan, typically organized and participating in choreographies (including pyrotechnics), often of outwardly intimidating demeanour, but distinguished from a violent hooligan (although overlap between both subcultures is possible)
6. An ultramarathon.
7. An ultra-prominent peak.
8. Code name used by British codebreakers during World War 2 for decrypted information gained from the enemy.

复数 ultras