Definition of nut

• n. - The fruit of certain trees and shrubs (as of the almond, walnut, hickory, beech, filbert, etc.), consisting of a hard and indehiscent shell inclosing a kernel.
• n. - A perforated block (usually a small piece of metal), provided with an internal or female screw thread, used on a bolt, or screw, for tightening or holding something, or for transmitting motion. See Illust. of lst Bolt.
• n. - The tumbler of a gunlock.
• n. - A projection on each side of the shank of an anchor, to secure the stock in place.
• v. i. - To gather nuts.