1. (noun)hazelnut, hazel, hazelnut tree any of several shrubs or small trees of the genus Corylus bearing edible nuts enclosed in a leafy husk Synonyms: hazeltree, cob, hazel, cobnut, filbert, hazelnut, hazelnut tree
2. (noun)hazelnut, filbert, cobnut, cob nut of any of several trees of the genus Corylus Synonyms: hazelnut tree, cob, cobnut, hazelnut, great black-backed gull, filbert, black-backed gull, hazel