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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. A rock-boring tool used in mining for sinking shafts.
  2. n. Medicine A trephine.
  3. v. To bore (a shaft) with a trepan.
  4. v. Medicine To trephine.
  5. v. To trap; ensnare.
  6. n. A trickster.
  7. n. A trick or snare.

Century Dictionary and Cyclopedia

  1. n. An instrument for boring; a borer. Specifically— An engine formerly used in sieges for piercing or making holes in the walls.
  2. n. The name given by the French to a boring-tool used for sinking wells and mining shafts to great depths and sometimes of great dimensions.
  3. n. An instrument, in the form of crown-saw, used by surgeons for removing parts of the bones of the skull, in order to relieve the brain from pressure or irritation. The trephine is an improved form of this instrument. See cuts under crown-saw and trephine.
  4. To perforate by a trepan, especially by the surgical trepan; operate on with a trepan.
  5. See trapan.

Wiktionary

  1. n. A tool used to bore through rock when sinking shafts.
  2. n. medicine A surgical instrument used to remove a circular section of bone from the skull; a trephine.
  3. v. transitive, manufacturing, mining To create a large hole by making a narrow groove outlining the shape of the hole and then removing the plug of material remaining by less expensive means.
  4. v. medicine To use a trepan; to trephine.
  5. n. archaic A trickster.
  6. v. archaic To trick; to ensnare; to seduce.

GNU Webster's 1913

  1. n. (Surg.) A crown-saw or cylindrical saw for perforating the skull, turned, when used, like a bit or gimlet. See trephine.
  2. n. (Mining) A kind of broad chisel for sinking shafts.
  3. v. (Surg.) To perforate (the skull) with a trepan, so as to remove a portion of the bone, and thus relieve the brain from pressure or irritation; to perform an operation with the trepan.
  4. n. A snare; a trapan.
  5. n. a deceiver; a cheat.
  6. v. To insnare; to trap; to trapan.

WordNet 3.0

  1. v. cut a hole with a trepan, as in surgery
  2. n. a surgical instrument used to remove sections of bone from the skull
  3. n. a drill for cutting circular holes around a center

Etymologies

  1. Possibly from Old English treppan ("to trap"). (Wiktionary)
  2. Middle English trepane, surgical crown saw, from Medieval Latin trepanum, from Greek trūpanon, borer, from trūpān, to pierce, from trūpē, hole. Origin unknown. (American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

  • “From the distracted and despairing man whom love and longing trepan from the lover under passion’s ban the prisoner of transport and distraction from this Kamar al-Zaman son of Shahriman to the peerless one of the fair Houris the pearl-union to the Lady Budur daughter of King Al Ghayur”

    The Book of The Thousand Nights And A Night

  • “The "bizarre bits" on display here include a bunch of medical specimens and instruments, such as the smallpox scab, various saws used for amputations and neurosurgery, and a trepan, a grotesque device used to perforate the skull, which was believed to aid in treating mental illness, epilepsy and migraines.”

    The Washington Post: Virginia Historical Society's odd gems offer uncommon insights into the past

  • “Relatively humane compared to the older method of using a hammer that would trepan the animal.”

    Think Progress » ThinkFast AM: June 20, 2006

  • “And if you wish to saw at once down to the membrane, and then remove the bone, you must also, in like manner, frequently take out the trepan and dip it in cold water.”

    On Injuries Of The Head

  • “But you must take care where you apply the trepan, and see that you do so only where it appears to be particularly thick, and having fixed the instrument there, that you frequently make examinations and endeavor by moving the bone to bring it up.”

    On Injuries Of The Head

  • “But if you have not charge of the treatment from the first, but undertake it from another after a time, you must saw the bone at once down to the meninx with a serrated trepan, and in doing so must frequently take out the trepan and examine with a sound (specillum), and otherwise along the tract of the instrument.”

    On Injuries Of The Head

  • “And you must not trepan any of them, nor run any risks in attempting to extract the pieces of bone, until they rise up of their own accord, upon the subsidence of the swelling.”

    On Injuries Of The Head

  • “And many of these require trepanning, but you must not apply the trepan to the sutures themselves, but on the adjoining bone.”

    On Injuries Of The Head

  • “When a bone is broken, or cleft, or contused, or otherwise injured, and when by mistake it has not been discovered, and neither the raspatory nor trepan has been applied as required, but the case has been neglected as if the bone were sound, fever will generally come on if in winter, and in summer the fever usually seizes after seven days.”

    On Injuries Of The Head

  • “For the trepan being heated by running round, and heating and drying the bone, burns it and makes a larger piece of bone around the sawing to drop off, than would otherwise do.”

    On Injuries Of The Head

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‘trepan’ has been looked up 1956 times, loved by 2 people, added to 14 lists, and has a Scrabble score of 8.