Meaning of SUB- in English

SUB-

sub- /sʌb/ BrE AmE 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

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.