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Opal vs Undefined - What's the difference?

opal | undefined |

As a noun opal

is opal.

As an adjective undefined is

lacking a definition or value.

opal

English

(wikipedia opal)

Noun

(en noun)
  • (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity, of the chemical formula Si]]O2· n[[water, H2O.
  • * {{quote-magazine, date=2012-03
    • , author=Lee A. Groat , title=Gemstones , volume=100, issue=2, page=128 , magazine=(American Scientist) citation , passage=Although there are dozens of different types of gems, among the best known and most important are […] . (Common gem materials not addressed in this article include amber, amethyst, chalcedony, garnet, lazurite, malachite, opals , peridot, rhodonite, spinel, tourmaline, turquoise and zircon.)}}
  • (biology, genetics, biochemistry) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."

    • Derived terms

    * fire opal * wood opal * opaline * opalesce

    References

    Anagrams

    * ----

    undefined

    English

    Adjective

    (wikipedia undefined) (-)
  • Lacking a definition or value.
  • (mathematics, computing) That does not have a meaning and is thus not assigned an interpretation.
    • The result of division by zero is undefined .

    Antonyms

    * defined