Definition of John apple in English:

John apple

Pronunciation /ˈdʒɒn ˌapl/

noun

historical
  • A kind of apple said to keep for two years and having after this time a shrivelled, withered appearance.

    Sometimes identified with the Northern Greening. Later examples appear to refer to other kinds of apple.

Origin

Early 17th century. Alteration (with reversal of the elements) of apple-john.