different between keyhole vs scutcheon

English

Etymology

From key +? hole.

Noun

keyhole (plural keyholes)

1. The hole in a lock where the key is inserted and turns.
2. Any small opening resembling the hole for a key in shape or function.
3. A circle cut out of a garment as a decorative effect, typically at the front or back neckline of a dress.
4. (carpentry) A hole or excavation in beams intended to be joined together, to receive the key that fastens them.
5. (engineering) A mortise for a key or cotter.
6. (lasers) A transient column of vapor or plasma formed when using high energy beams, such as lasers, for welding or cutting.

   laser keyhole welding

   keyhole plasma

7. (metallurgy) A welding method in which a hole forms in the surface immediately ahead of the puddle in the direction of welding. The hole is filled as the weld progresses.
8. (basketball) The free-throw lane together with the circle surrounding the free-throw line; key.
9. (astronomy) A gravitational keyhole.

Translations

Verb

keyhole (third-person singular simple present keyholes, present participle keyholing, simple past and past participle keyholed)

1. (ordnance) To strike a target after wobbling in flight so that the long axis of the bullet does not follow the line of flight; typically due to insufficient spin resulting from the rifling in the barrel.

Derived terms

• keyhole neckline
• keyhole surgery
• keyhole wound

English

Etymology

Aphetic form of escutcheon.

Pronunciation

• (UK) IPA^(key): /?sk?t?(?)n/

  Rhymes: -?t??n

Noun

scutcheon (plural scutcheons)

1. An escutcheon; an emblazoned shield.
   • 1590, Edmund Spenser, The Faerie Queene, III.4:

     But she againe him in the shield did smite / With so fierce furie and great puissaunce, / That, through his three-square scuchin piercing quite / And through his mayled hauberque, by mischaunce / The wicked steele through his left side did glaunce.

   • 1627, Francis Bacon, Essays of Francis Bacon or Counsels, Civil and Moral, Chapter 29. "Of the True Greatness of Kingdoms and Estates":

     There be now, for martial encouragement, some degrees and orders of chivalry; which nevertheless are conferred promiscuously, upon soldiers and no soldiers; and some remembrance perhaps, upon the scutcheon; and some hospitals for maimed soldiers; and such like things.
2. An escutcheon; a small plate of metal, such as the shield around a keyhole.

Derived terms

• scutcheoned
• scutcheonless