fil·bert
noun/ˈfɪlbət/
/ˈfɪlbərt/
(especially North American English)- a type of hazel tree that produces oval nuts, also called filberts
一种产椭圆形坚果的榛树 Word OriginMiddle English fylberd, from Anglo-Norman French philbert, dialect French noix de filbert (so named because it is ripe about 20 August, the feast day of St Philibert).