Definition of sub- in US English:

sub-

prefix

  • 1At, to, or from a lower level or position.

    ‘subalpine’
    ‘sub-basement’
    1. 1.1 Lower in rank.
      ‘subdeacon’
      low-ranking, lower-ranking, subordinate, sub-, lesser, lower, minor, secondary, inferior
      View synonyms
    2. 1.2 Of a smaller size; of a subordinate nature.
      ‘subculture’
    3. 1.3 Of lesser quality; inferior.
      ‘subhuman’
      ‘substandard’
  • 2Somewhat; nearly; more or less.

    ‘subantarctic’
  • 3Denoting a later or secondary action of the same kind.

    ‘sublet’
    ‘subdivision’
    ‘subsequent’
  • 4Denoting support.

    ‘subvention’
  • 5Chemistry
    In names of compounds containing a relatively small proportion of a component.

    ‘suboxide’

Usage

Sub- is also found assimilated in the following forms: suc- before c (success); suf- before f (suffice); sug- before g (suggestion); sup- before p (supplicate); sur- before r (surreptitious); sus- before c (susceptible), p (suspect), t (sustain)

Origin

From Latin sub ‘under, close to’.

Pronunciation

sub-

/səb//səb/