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filbert

n.
  1. (Bot.) The fruit of the Corylus Avellana or Corylus maxima, also called the hazel; the hazelnut. It is an oval nut, containing a kernel that has a mild, farinaceous, oily taste, agreeable to the palate.
  2. (Bot.) The tree bearing the filbert; the hazelnut tree.
    3. Filbert gall (Zoöl.),
    a gall resembling a filbert in form, growing in clusters on grapevines. It is produced by the larva of a gallfly (Cecidomyia).