sub- - definition and synonyms

prefix 

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/sʌb/
  1. 1
    one small part of a larger thing: used with some nouns
     Synonyms and related words
  2. 2
    smaller or less important than someone or something: used with some nouns

    a sub-post office

     Synonyms and related words
  3. 3
    below or under something: used with some nouns and adjectives

    subaqua diving (=diving under water)

    substandard (=below average)

     Synonyms and related words
    1. a.
      further south: used with some nouns and adjectives

      sub-Saharan Africa

       Synonyms and related words