Meaning

noun any of several shrubs or small trees of the genus Corylus bearing edible nuts enclosed in a leafy husk

noun nut of any of several trees of the genus Corylus

originEquivalent to hazel + nut; from Middle English haselnote, from Old English hæselhnutu (“hazelnut”). Cognate with West Frisian hazzenút (“hazelnut”), Saterland Frisian Hoaselnuute (“hazelnut”), Dutch hazelnoot, German Haselnuss.

Etymology from Wiktionary, CC BY-SA 3.0