Beurre n. (Bot.) A beurré (or buttery) pear, one with the meat soft and melting; used with a distinguishing word; as, Beurré d'Anjou; Beurré Clairgeau.
... the morning meadows wet, Expound the Vedas of the violet, Or, hid in vines, peeping through many a loop, See the plum redden, and the beurre stoop. ... — Poems - Household Edition • Ralph Waldo Emerson