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.