the world > animals > mammals > group Ungulata (hoofed) > family Equidae (general equines) > body or parts of horse > [noun] > leg > foreleg > chestnut (knob of skin on) (3)
The hard knob in the skin of the horse at the inner side of the fore-legs; supposed to represent the thumbnail of other animals. Cf. castor, n.4
(See quot. and cf. chestnut, n.)
(a) an eye able to see or adapted for seeing in the dark (usually in plural); (b) U.S. = chestnut, n. 5.