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ENGLISH · A WORD WITH POSSIBILITIES

keystone.

The top stone of an arch.

8 characters2 syllables approx.English language

Meaning & usage

noun/ˈkiː.stəʊn/
  1. The top stone of an arch.

  2. Something on which other things depend for support.

  3. A retail price that is double the cost price; a markup of 100%.

  4. The combination of the shortstop and second baseman.

Where this word comes from

From key + stone. Definition 4 (retail) possibly originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone".

verb/ˈkiː.stəʊn/
  1. To distort (an image) by projecting it onto a surface at an angle, which for example causes a square to look like a trapezoid.

    transitive
  2. To double the cost price in order to determine the retail price; to apply a markup of 100%.

    transitive
Where this word comes from

From key + stone. Definition 4 (retail) possibly originated in the jewelry industry in the magazine called "Jewelers' Circular-Keystone".

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.