A screw is a small metal rod with a notch in the top that's used as a fastener. You can attach one piece of wood to another by rotating a screw through the two surfaces.

A screw is similar to a nail, but instead of hammering it in, you turn it repeatedly with a screwdriver. The spiral ridges of a screw attach it securely to whatever you screw it into — metal, wood, or a bolt with similar ridges. Etymologists aren't sure about the origins of screw, although some suspect it comes from the Latin scrobis, "ridge or trench."

Definitions of screw
  1. noun
    a simple machine of the inclined-plane type consisting of a spirally threaded cylindrical rod that engages with a similarly threaded hole
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    type of:
    inclined plane
    a simple machine for elevating objects; consists of plane surface that makes an acute angle with the horizontal
  2. noun
    a fastener with a tapered threaded shank and a slotted head
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    show 18 types...
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    Allen screw
    a screw with a hexagonal hole in the head
    a screw that screws into a nut to form a fastener
    cap screw
    a threaded screw for machine parts; screws into a tapped hole
    machine screw
    a screw used either with a nut or with a tapped hole; slotted head can be driven by a screwdriver
    metal screw
    screw made of metal
    Phillips screw
    a screw with a special head having crossed slots
    a screw (often without a head) that fits into the boss or hub of a wheel or cam etc. and prevents motion of the part relative to the shaft on which it is mounted
    a screw that is used to adjust the tension on a spring
    screw designed to be turned with the thumb and fingers
    a metal screw that tapers to a point so that it can be driven into wood with a screwdriver
    screw thread on a gear with the teeth of a worm wheel or rack
    carriage bolt
    a roundheaded bolt for timber; threaded along part of the shank; inserted into holes already drilled
    expansion bolt
    a bolt that has an attachment that expands as the bolt is driven into a surface
    kingbolt, kingpin, swivel pin
    bolt that provides a steering joint in a motor vehicle
    lag bolt, lag screw
    a heavy woodscrew with a square or hexagonal head that is driven in with a wrench
    machine bolt
    a bolt with a square or hexagonal head on one end and a threaded shaft on the other end; tightened with a wrench; used to connect metal parts
    screw eye
    a woodscrew having its shank bent into a ring
    stove bolt
    a small machine bolt
    type of:
    fastener, fastening, fixing, holdfast
    restraint that attaches to something or holds something in place
  3. noun
    a propeller with several angled blades that rotates to push against water or air
    synonyms: screw propeller
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    type of:
    propeller, propellor
    a mechanical device that rotates to push against air or water
  4. verb
    turn like a screw
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    screw up
    screw or turn higher
    type of:
    go around, revolve, rotate
    turn on or around an axis or a center
  5. verb
    cause to penetrate, as with a circular motion
    synonyms: drive in
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    type of:
    go around, revolve, rotate
    turn on or around an axis or a center
  6. verb
    tighten or fasten by means of screwing motions
    Screw the bottle cap on”
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    loosen by turning
    type of:
    fasten, tighten
    make tight or tighter
  7. verb
    have sexual intercourse with
    synonyms: have intercourse, have sex, love, roll in the hay
    make out, neck
    kiss, embrace, or fondle with sexual passion
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    have, take
    have sex with; archaic use
    have sex without being married
    engage freely in promiscuous sex, often with the husband or wife of one's friends
    bed-hop, bedhop, sleep around
    be sexually active with more than one partner
  8. noun
    slang for sexual intercourse
    synonyms: roll in the hay
  9. noun
    someone who guards prisoners
    synonyms: gaoler, jailer, jailor, prison guard, turnkey
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    type of:
    someone in charge of other people
    law officer, lawman, peace officer
    an officer of the law
  10. verb
    defeat someone through trickery or deceit
    synonyms: cheat, chicane, chouse, jockey, shaft
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    type of:
    beat, beat out, crush, shell, trounce, vanquish
    come out better in a competition, race, or conflict
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