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.
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.
The tumbler of a gunlock.
A projection on each side of the shank of an anchor, to secure the stock in place.
When people say, you know, 'Good teacher,' 'Prophet,' 'Really nice guy'... this is not how Jesus thought of Himself. So you're left with a challenge in that, which is either Jesus was who he said he was or a complete and utter nut case. You have to make a choice on that. Bono
Today's mighty oak is just yesterday's nut, that held its ground. David Icke
My point is that perceptual bias can affect nut jobs and scientists alike. If we hold too rigidly to what we think we know, we ignore or avoid evidence of anything that might change our mind. Martha Beck