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

  • n. A clear colorless opal.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A form of opal

from the GNU version of the Collaborative International Dictionary of English

  • n. A pellucid variety of opal in globules looking like colorless gum or resin; -- called also Müller's glass.

from The Century Dictionary and Cyclopedia

  • n. A pellucid variety of opal, resembling colorless gum or resin.


Greek hualos, glass + -ite1.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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  • Presumably same as noun hyaline.

    October 1, 2008

  • "Os was already far behind us, and would have been out of sight had not the atmosphere been as clear as hyalite." -- Gene Wolfe, The Urth of the New Sun

    October 1, 2008