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    sub-

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    sub-
    sub- /sʌb/ prefix
     Language: Latin
     Origin: sub 'under, close to'
    1. under or below a particular level or thing:
        sub-zero temperatures
        subsoil (=beneath the surface)
    2. less important or powerful than someone or something, or of lower rank than someone:
        a sublieutenant
    3. part of a bigger whole:
        a subsection
        a subcommittee
    4. not as good as other people or things:
        substandard housing
        subnormal intelligence
    5. technical almost:
        subtropical heat