(from the article `filbert`) ...the genus Corylus in the birch family (Betulaceae) and the edible nuts they produce. The former common name for the genus was hazel; various ... Found on http://www.britannica.com/eb/a-z/c/102
Cob'nut` noun 1. (Com.) A large roundish variety of the cultivated hazelnut. 2. A game played by children with nuts. Found on http://www.encyclo.co.uk/webster/C/100