From The Collaborative International Dictionary of English v.0.48 [gcide]:
filbert \fil"bert\, n. [Perh. fr. fill + bread, as filling the
bread or husk; cf. G. bartnuss (lit., bread nut) filbert; or
perh. named from a St.Philibert, whose day, Aug. 22, fell in
the nutting season.]
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.
[1913 Webster]
Note: In England filberts are usually large hazelnuts,
especially the nuts from selected and cultivated trees.
The American hazelnuts are of two other species,
{Corylus Americana} and {Corylus cornuta}, and are also
sometimes called filberts.
[1913 Webster +PJC]
2. (Bot.) The tree bearing the filbert; the hazelnut tree.
[PJC]
{Filbert gall} (Zool.), a gall resembling a filbert in form,
growing in clusters on grapevines. It is produced by the
larva of a gallfly ({Cecidomyia}).
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
filbert
n 1: small nut-bearing tree much grown in Europe [syn: {cobnut},
{filbert}, {Corylus avellana}, {Corylus avellana grandis}]
2: nut of any of several trees of the genus Corylus [syn:
{hazelnut}, {filbert}, {cobnut}, {cob}]
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