From Longman Dictionary of Contemporary Englishhazelnutha‧zel‧nut /ˈheɪzəlnʌt/ noun [countable] 
HBPDFFthe nut of the hazel1 tree
HBPDFFthe nut of the hazel1 treeExamples from the Corpus
hazelnut• Planters Plantation Mix is a combination of almonds, hazelnuts, peanuts and raisins.• There is a sharp tang mixed with an aroma reminiscent of fresh walnuts and hazelnuts.• It is a great looking dish that gets a textural bonus courtesy of crunchy hazelnuts.• The female hazelnut flowers have extended their tiny purple tongues, but the male flowers resemble those of the alders.• A few years later I had my first sip of Fra Angelica liqueur, which is made from roasted hazelnuts.• Using two forks, dip in the skinned hazelnuts, and stir until coated.• Coat sides with hazelnuts, pipe remaining cream on top, decorate with remaining strawberries and quartered chocolate squares. 