A needle is a small, pointed piece of metal that's used in medicine or sewing. When a tailor sews a button on your shirt or even when a doctor sews your skin back together, a needle is used.

Needles are sharp — when you stitch fabric with a needle, you might use a metal thimble to protect your fingertip. When a doctor or nurse uses a needle, it needs to be very sharp — it has to be able to penetrate human skin to stitch up a wound or inject a medication. When you needle someone, you don't literally poke them, but you do annoy or provoke them in some way.

Definitions of needle
  1. noun
    a sharp pointed implement (usually steel)
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    crochet hook, crochet needle
    a needle with a hook on the end; used in crocheting
    dry point
    a steel needle for engraving without acid on a bare copper plate
    hypodermic needle
    a hollow needle
    knitting needle
    needle consisting of a slender rod with pointed ends; usually used in pairs
    packing needle
    a large needle used to sew up canvas packages
    sewing needle
    a needle used in sewing to pull thread through cloth
    darning needle, embroidery needle
    a long needle with an eye large enough for heavy darning or embroidery thread
    a long thin sewing needle with a sharp point
    upholstery needle
    any of several very heavy and sometimes curved sewing needles used by upholsterers
    type of:
    instrumentation (a piece of equipment or tool) used to effect an end
  2. noun
    a slender pointer for indicating the reading on the scale of a measuring instrument
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    type of:
    an indicator as on a dial
  3. noun
    the leaf of a conifer
    synonyms: acerate leaf
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    type of:
    simple leaf
    a leaf that is not divided into parts
  4. noun
    a stylus that formerly made sound by following a groove in a phonograph record
    synonyms: phonograph needle
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    type of:
    a sharp pointed device attached to the cartridge of a record player
  5. verb
    prick with a needle
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    type of:
    prick, prickle
    make a small hole into, as with a needle or a thorn
  6. verb
    goad or provoke, as by constant criticism
    “He needled her with his sarcastic remarks”
    synonyms: goad
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    type of:
    beset, chevvy, chevy, chivvy, chivy, harass, harry, hassle, molest, plague, provoke
    annoy continually or chronically
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