filbert

noun
🔊/ˈfɪlbət/
🔊/ˈfɪlbərt/
(especially North American English)
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  1. a type of hazel tree that produces oval nuts, also called filberts
    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).