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Definition of nut : 1. 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.
2. A projection on each side of the shank of an anchor, to secure the stock in place.
3. 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.
4. The tumbler of a gunlock.
5. To gather nuts.

Synonyms:

crown, bug, weirdo, crosspatch, wise, burden, bur, chicken feed, lusus naturae, globe, bollock, testicle, fanatic, methamphetamine, churl, monstrosity, screwball, junkie, loony, fruit, methamphetamine hydrochloride, junky, nutcase, lump, bolt, cap, block, stone, cranium, skull, noddle, head, clump, conk, drug addict, noggin, en, chalk, pate, fruitcake, formal, difficulty, egg, loon, dingbat, dome, shabu, bean, grouch, deoxyephedrine, eggs, concern, ballock, grump, ball, kernel, nut case, body, musket ball, chunk, ice, glass, noodle, trash, weirdie, starter, poll, meth, seed, orchis, monster, glob, brain, eccentric, orb, bullock block, cuckoo, testis, clod, responsibility, ding-a-ling

enthusiast (part of speech: noun)

aficionado, supporter, devotee, fiend, enthusiast, fan, zealot, freak, fancier, patron, addict, buff, connoisseur

nut (part of speech: noun)

Brazil nut, almond, coconut, cashew, hazelnut, filbert, pistachio, peanut, beechnut, butternut, pecan, walnut, acorn, chestnut, pine nut

lunatic (part of speech: noun)

kook, maniac, crackpot, psychotic, madman, crazy, crank, psychopath, lunatic, neurotic

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