Definition of white heron in US English:

white heron

noun

  • (Also "great white heron") either of two herons with white plumage, the great egret, Ardea alba, found worldwide, and a great blue heron of the subspecies A. herodias occidentalis, of Florida and the Caribbean.

Origin

Late 16th century; earliest use found in George Turberville (c1543–c1597), poet and translator.