What is "castanea vesce"

Chestnut \Chest"nut\, n. [For chesten-nut; OE. chestein, chesten, chastein, chestnut, fr. AS. cisten in cistenbe['a]m chestnut tree, influenced by OF. chastaigne, F. ch[^a]taigne, both the AS. and the F. words coming from L. castanea a chestnut, Gr. ?, fr. ? a city of Pontus, where chestnut trees grew in abundance, and whence they were introduced into Europe. Cf. Castanets.]

1. (Bot.) The edible nut of a forest tree ( Castanea vesce) of Europe and America. Commonly two or more of the nuts grow in a prickly bur.

2. The tree itself, or its light, coarse-grained timber, used for ornamental work, furniture, etc.

3. A bright brown color, like that of the nut.

4. The horse chestnut (often so used in England).

5. One of the round, or oval, horny plates on the inner sides of the legs of the horse, and allied animals.

6. An old joke or story. [Slang]

   Chestnut tree, a tree that bears chestnuts.