Definition of subfield in US English:

subfield

noun

  • 1A secondary or subsidiary field or area of land.

  • 2A secondary or subordinate field or area of study, research, etc.

  • 3Mathematics. A field forming a subset of another field with the same binary operations.

Origin

Mid 19th century; earliest use found in American Cotton Planter. From sub- + field.

Pronunciation

subfield

/ˈsʌbfiːld/