keystone

[ kee-stohn ]
See synonyms for: keystonekeystones on Thesaurus.com

noun
  1. the wedge-shaped piece at the summit of an arch, regarded as holding the other pieces in place.

  2. something on which associated things depend: the keystone of one's philosophy.

  1. Also called keystone sack .Baseball Slang. second base (def. 1).

Origin of keystone

1
First recorded in 1630–40; key1 + stone

Other words for keystone

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

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British Dictionary definitions for keystone

keystone

/ (ˈkiːˌstəʊn) /


noun
  1. Also called: headstone, quoin the central stone at the top of an arch or the top stone of a dome or vault

  2. something that is necessary to connect or support a number of other related things

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