1. Medium-sized birch of eastern North America having white or pale grey bark and valueless wood; occurs often as a second-growth forest tree
   "Grey birch quickly colonized the abandoned field"; "grey birch quickly colonized the abandoned field"; "American grey birch quickly colonized the abandoned field"; "American grey birch quickly colonized the abandoned field";
   - gray birch [US], American grey birch [Brit, Cdn], American gray birch [US], Betula populifolia

Derived forms: grey birches

Type of: birch, birch tree

Part of: Betula, genus Betula

Encyclopedia: Grey birch