English

flatfield

From flat + field.

A compound of flat + field

Proto-Germanic *flataz ‘flat’

Old Norse flatr ‘flat, level’

Middle English flat ‘level’

English flat

Proto-Germanic *felþuz ‘field’

Proto-West Germanic *felþu ‘field’

Old English feld ‘field’

Middle English feld ‘field’

English field

Today it means

noun A flat portion of a lens or curved mirror, especially one introduced accidentally or by damage.

Language periods are conventional ranges, not dates for this word.

Etymograph / flatfield