nut

noun

1. Any of various hard-shelled seeds or hard, dry fruits from various families of plants.
2. Such a fruit that is indehiscent.
3. A piece of hardware, typically metal and typically hexagonal or square in shape, with a hole through it having internal screw threads, intended to be screwed onto a threaded bolt or other threaded shaft.
4. The head.
5. A crazy person.
6. An extreme enthusiast.
7. An extravagantly fashionable young man.
8. The glans (structure at the extremity of the penis or of the clitoris).
9. A testicle, often used in the plural form.
10. Semen, ejaculate, cum.
11. Orgasm, ejaculation; especially release of semen; cumshot
12. Monthly expense to keep a venture running.
13. The amount of money necessary to set up some venture; set-up costs.
14. A stash of money owned by an extremely rich investor, sufficient to sustain a high level of consumption if all other money is lost.
15. On stringed instruments such as guitars and violins, the small piece at the peghead end of the fingerboard that holds the strings at the proper spacing and, in most cases, the proper height.
16. En, a unit of measurement equal to half of the height of the type in use.
17. A shaped piece of metal, threaded by a wire loop, which is jammed in a crack in the rockface and used to protect a climb. (Originally, machine nuts [sense #2] were used for this purpose.)
18. The best possible hand of a certain type. Compare nuts (“the best possible hand available”).
19. The tumbler of a gunlock.
20. A projection on each side of the shank of an anchor, to secure the stock in place.