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From Biology-Online Dictionary | Biology-Online Dictionary
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1. Consisting wholly, or in part, of pith; abounding in pith; as, a pithy stem; a pithy fruit.

2. Having nervous energy; forceful; cogent. This pithy speech prevailed, and all agreed. (Dryden) In all these goodman Fact was very short, but pithy.

(Science: zoology) (Addison) Pithy gall, a large, rough, furrowed, oblong gall, formed on blackberry canes by a small gallfly (Diastrophus nebulosus).

Origin: Pithier; Pithiest.