From Wiktionary, the free dictionary
From Latin castaneam, accusative of castanea, from Ancient Greek κᾰ́στᾰνᾰ (kástana).
castanna f (plural castannas)
- chestnut
c. 1250, Alfonso X, Lapidario, f. 14r:Et es fuerte de quebrantar. ⁊ ay dellas grandes ⁊ dellas pequẽnas p̃o siempre la fallan de figura de castanna.- And it is strong and hard to break. And they can be big and small, but they are always found in the shape of a chestnut.
- Spanish: castaña (see there for further descendants)
