Definition of sub- prefix from the Oxford Advanced Learner's Dictionary

     

    sub-

     prefix
    prefix
    BrE BrE//sʌb//
     
    ; NAmE NAmE//sʌb//
     
     
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  1. 1(in nouns and adjectives) below; less than sub-zero temperatures a subtropical (= almost tropical) climate substandard
  2. 2(in nouns and adjectives) under subway submarine
  3. 3(in verbs and nouns) a smaller part of something subdivide subset More Like This Prefixes a-, ante-, anti-, be-, co-, de-, demi-, dis-, en-, ex-, extra-, hyper-, hypo-, il-, in-, infra-, inter-, intra-, mis-, non-, off-, oft-, out-, over-, para-, post-, pre-, pro-, re-, retro-, semi-, sub-, trans-, ultra-, un-, under-, up-See worksheet.
  4. Word Originfrom Latin sub ‘under, close to’.
See the Oxford Advanced American Dictionary entry: sub-