chestnut

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Any of several deciduous trees of the genus Castanea native to northern temperate regions, having alternate simple toothed leaves, and nuts that are enclosed in a prickly husk.
2. n. The often edible nut of any of these trees.
3. n. The wood of any of these trees.
4. n. Any of several other plants, such as the horse chestnut.
5. n. A moderate to deep reddish brown.
6. n. A reddish-brown horse.
7. n. A small hard callus on the inner surface of a horse's foreleg.
8. n. An old, frequently repeated joke, story, or song.
9. adj. Of a moderate to deep reddish brown.

Century Dictionary and Cyclopedia

1. n. The fruit of trees of the genus Castanea. See 2. The chestnuts of commerce known as Spanish or sweet chestnuts are obtained from Spain and Italy, and are larger though less sweet than the American variety.
2. n. The tree Castanea vesca, natural order Cupuliferœ, a native of western Asia, southern Europe, and the United States east of the Mississippi. It is a stately tree, attaining a height of from 80 to 100 feet, bearing staminate flowers in long slender aments, and nuts inclosed two or three together in a globose prickly envelop called the bur. The wood is light, soft, coarse-grained, and brittle; it is largely used in cabinet-making, and for railway-ties, fencing, etc. The young wood is more elastic, and is used for hoops and similar purposes.
3. n. A name given to certain trees or plants of other genera, and to their fruit. See below.
4. n. The color of a chestnut; a reddish-brown color.
5. n. In farriery, the bur or horny wart-like excrescence on the inner side of a horse's leg.
6. n. [In allusion to a stale or worm-eaten chestnut.] An old joke; a trite jest; a stale pun or anecdote; a “Joe Miller.”
7. n. A worn-out phrase or catchword; a phrase or expression serious in form and intent, but which has ceased, through futile repetition, to command interest or respect.
8. Of the color of a chestnut; of a reddish-brown color; castaneous.
9. Also spelled chesnut.

Wiktionary

1. n. A tree or shrub of the genus Castanea.
2. n. The nut of this tree or shrub.
3. n. uncountable A dark, reddish-brown colour/color.
4. n. A reddish-brown horse.
5. n. uncountable The wood of a chestnut tree.
6. n. idiomatic (Often "old chestnut") A worn-out meme; a work so often repeated as to have grown tiresome.
7. n. A part of a horse found on the inner leg, similar to a birthmark on a human.
8. adj. Of a deep reddish-brown colour, like that of a chestnut.

GNU Webster's 1913

1. n. (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. n. The tree itself, or its light, coarse-grained timber, used for ornamental work, furniture, etc.
3. n. A bright brown color, like that of the nut.
4. n. The horse chestnut (often so used in England).
5. n. One of the round, or oval, horny plates on the inner sides of the legs of the horse, and allied animals.
6. n. Slang An old joke or story.
7. adj. Of or pertaining of a chestnut; of a reddish brown color.

WordNet 3.0

1. n. edible nut of any of various chestnut trees of the genus Castanea
2. n. any of several attractive deciduous trees yellow-brown in autumn; yield a hard wood and edible nuts in a prickly bur
3. adj. (of hair or feathers) of a golden brown to reddish brown color
4. n. a small horny callus on the inner surface of a horse's leg
5. n. wood of any of various chestnut trees of the genus Castanea
6. n. a dark golden-brown or reddish-brown horse
7. n. the brown color of chestnuts