ultra- - definition and synonyms

prefix 

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/ʌltrə/
  1. 1
    extremely: used with many adjectives

    an ultra-modern kitchen

    an ultra-cautious approach

    ultra-right-wing organizations

     Synonyms and related words
  2. 2
    science outside a particular range: used with some nouns and adjectives

    ultra-short radio waves

     Synonyms and related words