Definition of old field birch in US English:

old field birch

noun

  • Any of several North American birches, especially the white birch, Betula populifolia.

Origin

Early 19th century; earliest use found in François André Michaux (1770–1855). From old field + birch.

Pronunciation

old field birch

/ˌəʊl(d) fiːld ˈbəːtʃ/