from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A movie rating indicating that admission will not be granted to anyone under the age of 17.
  • The symbol for reactance.
  • The symbol for the Roman numeral 10.
  • abbr. Christ (Greek &KHgr;&rgr;&igr;&sgr;&tgr;&ogr;&sfgr;, Christos)
  • abbr. Christian
  • abbr. experimental
  • abbr. extra

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Suitable only for those aged 16 or (later) 18 years and over.
  • adj. Obscene.
  • n. The twenty-fourth letter of the basic modern Latin alphabet.
  • n. The number 10.
  • n. A symbol of the IPA, representing a voiceless uvular fricative.
  • n. strike
  • n. A hazard indicator, sometimes incorporated into standard labelling and signage systems
  • n. An unknown quantity or unknown value.
  • n. The twenty-fourth letter of the English alphabet, called ex and written in the Latin script.
  • n. Any mark that looks like that letter, such as such a mark made by a person who cannot read or write, in lieu of a signature.
  • n. The spot behind the goal.
  • n. Ecstasy, a particular street drug.
  • n. One of the tristimulus values which, with Y and Z, defines coordinates in a three-dimensional color space. Pronounced big X or cap X.
  • abbr. Christ
  • abbr. cross, crossing


Possibly from skull and crossbones (Wiktionary)
Presumably by abbreviation of the pronunciation of ecstasy. (Wiktionary)
From Christ by abbreviation, from Ancient Greek Χ (Ch, "(letter chi)"), from Χριστός (Christós, "Christ"). (Wiktionary)
As defined in CIE 1931 color space. (Wiktionary)



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