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Keystone vs Mainspring - What's the difference?

keystone | mainspring |

As nouns the difference between keystone and mainspring

is that keystone is (architecture) the top stone of an arch while mainspring is the principal spring of a clockwork mechanism, that drives it by uncoiling.

keystone

English

Noun

(en noun)
  • (architecture) The top stone of an arch.
  • A native or resident of the American state of Pennsylvania.

    • Derived terms

    * keystone correction * keystone picture * keystone pricing

    Anagrams

    *

    mainspring

    English

    Noun

    (en noun)
  • The principal spring of a clockwork mechanism, that drives it by uncoiling.
  • * 1922 , (Margery Williams), (The Velveteen Rabbit)
    • He was wise, for he had seen a long succession of mechanical toys arrive to boast and swagger, and by-and-by break their mainsprings and pass away.
  • (figuratively) The most important reason for something.
    • My daughter is the mainspring of my life.