ultra- - WordReference.com Dictionary of English

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- - Ulsterman
  - ult.
  - ulterior
  - ultima Thule
  - ultimata
  - ultimate
  - ultimatum
  - ultimo
  - ultra
  - ultra vires
  - ultra-
  - ultra-high frequency
  - ultracentrifuge
  - ultradian
  - ultrafiltration
  - ultraism
  - ultralight
  - ultramafic
  - ultramarine
  - ultramicroscope
  - ultramicroscopic
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ultra-

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Concise Oxford English Dictionary © 2008 Oxford University Press:
ultra-/ˈʌltrə/

▶prefix

1 to an extreme degree; very: ultramicroscopic.

2 beyond: ultramontane.

– origin from L. ultra ‘beyond’.

'ultra-' also found in these Oxford entries:

ne plus ultra - outrage - plasteel - UHF - UHT - ultra - ultradian - ultra-high frequency - ultramontane - ultramundane - ultra vires - UWB

Forum discussions with the word(s) "ultra-" in the title:

My boss was being ultra-nice to me
ultra-smooth

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