American English

Definition of sub- prefix from the Oxford Advanced American Dictionary



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  1. 1(in nouns and adjectives) below; less than subfreezing 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
See the Oxford Advanced Learner's Dictionary entry: sub-