French berry

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(Bot.) the berry of a species of buckthorn (Rhamnus catharticus), which affords a saffron, green or purple pigment.

See also: French

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
One is also advised not to touch the pancakes and waffles as the staff will serve a fresh batch upon order, with authentic Canadian maple, varieties of honey, and French berry comfitures.
A delicious Victoria cake -- "a vanilla bean cake filled with high-quality French berry jam and fresh berries on top" -- is served every day and is a customers' favorite.
Loved the daft old bat on a repeat of Family Fortunes who, when asked by Les Dennis to name a type of berry, looked puzzled for a second before saying: "A French berry?" Take it she was a big fan of Frank Spencer.