• Webster's Revised Unabridged Dictionary
    • n Cerulein (Chem) A fast dyestuff, C20H8O6, made by heating gallein with strong sulphuric acid. It dyes mordanted fabrics green.
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Century Dictionary and Cyclopedia
    • n cerulein Same as azulene.
    • n cerulein A coal-tar color used in dyeing, prepared by treating gallein with strong sulphuric acid. It is mostly used in dyeing or printing cotton fabrics, although applicable to wool and silk. It produces fast olive-green shades. Sometimes called anthracene green.
    • n cerulein See cerulein.
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Chambers's Twentieth Century Dictionary
    • n Cerulein sėr-ū′lē-in a coal-tar colour chiefly used in dyeing cotton fabrics, producing fast olive-green shades.
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Webster's Revised Unabridged Dictionary
L. caeruleus, sky-blue