A nut is a kind of fruit made of a large, edible seed with a very hard shell around it. The nuts that squirrels typically gather (sometimes storing them temporarily in their cheek pouches) are acorns.

It might seem strange that a nut is a fruit, since until they've been cracked open, most nuts are as hard and inedible as rocks. Think of the meat of a walnut or almond that hides inside — this is the edible seed within the fruit. If someone calls you a nut, or describes you as nuts or nutty, they think you're crazy or wacky, and when you refer to "a tough nut to crack," you're talking about a tricky problem.

Definitions of nut
  1. noun
    usually large hard-shelled seed
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    edible nut
    a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell
    cedar nut, cembra nut
    the seed of the Swiss pine
    cola nut, kola nut
    bitter brown seed containing caffein; source of cola extract
    nuts of forest trees (as beechnuts and acorns) accumulated on the ground
    palm kernel, palm nut
    seed of any oil palm
    a small nut
    bunya bunya
    nut tasting like roasted chestnuts; a staple food of Australian aborigines
    earthnut, goober, goober pea, groundnut, monkey nut, peanut
    pod of the peanut vine containing usually 2 nuts or seeds; `groundnut' and `monkey nut' are British terms
    oval-shaped edible seed of the almond tree
    quandong nut
    edible nutlike seed of the quandong fruit
    small sweet triangular nut of any of various beech trees
    nut of any of various walnut trees having a wrinkled two-lobed seed with a hard shell
    brazil, brazil nut
    three-sided tropical American nut with white oily meat and hard brown shell
    oily egg-shaped nut of an American tree of the walnut family
    souari nut
    a large nutlike seed of a South American tree
    cashew, cashew nut
    kidney-shaped nut edible only when roasted
    edible nut of any of various chestnut trees of the genus Castanea
    chincapin, chinkapin, chinquapin
    small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut
    cob, cobnut, filbert, hazelnut
    nut of any of several trees of the genus Corylus
    cocoanut, coconut
    large hard-shelled oval nut with a fibrous husk containing thick white meat surrounding a central cavity filled (when fresh) with fluid or milk
    grugru nut
    nut of Brazilian or West Indian palms
    hickory nut
    small hard-shelled nut of North American hickory trees especially the shagbark hickories
    macadamia nut
    nutlike seed with sweet and crisp white meat
    smooth brown oval nut of south central United States
    pignolia, pine nut, pinon nut
    edible seed of any of several nut pines especially some pinons of southwestern North America
    pistachio, pistachio nut
    nut of Mediterranean trees having an edible green kernel
    the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it
    type of:
    a small hard fruit
  2. verb
    gather nuts
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    type of:
    collect, garner, gather, pull together
    assemble or get together
  3. noun
    a whimsically eccentric person
    synonyms: crackpot, crank, fruitcake, nut case, screwball
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    type of:
    eccentric, eccentric person, flake, geek, oddball
    a person with an unusual or odd personality
  4. noun
    someone who is so ardently devoted to something that it resembles an addiction
    “a car nut
    synonyms: addict, freak, junkie, junky
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    gym rat
    someone who spends all leisure time playing sports or working out in a gymnasium or health spa
    type of:
    enthusiast, partisan, partizan
    an ardent and enthusiastic supporter of some person or activity
  5. noun
    a small (usually square or hexagonal) metal block with internal screw thread to be fitted onto a bolt
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    hex nut
    a nut with a hexagonal shape
    locknut, safety nut
    supplementary nut that is screwed down on a primary nut to prevent it from loosening
    square nut
    nut with a square shape
    packing nut, stuffing nut
    a nut used to tighten a stuffing box
    butterfly nut, thumbnut, wing nut, wing screw, wing-nut
    a threaded nut with winglike projections for thumb and forefinger leverage in turning
    type of:
    a solid piece of something (usually having flat rectangular sides)
  6. noun
    one of the two male reproductive glands that produce spermatozoa and secrete androgens
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    a man's testicles (from Cockney rhyming slang: cobbler's awl rhymes with ball)
    undescended testicle, undescended testis
    a testis that fails to move into the scrotum as the male fetus develops
    type of:
    gonad, sex gland
    a gland in which gametes (sex cells) are produced
    male reproductive gland
    the reproductive organs of a man
  7. noun
    half the width of an em
    synonyms: en
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    type of:
    linear measure, linear unit
    a unit of measurement of length
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