• Webster's Revised Unabridged Dictionary
    • Quinizarin (Chem) A yellow crystalline substance produced artificially. It is isomeric with alizarin.
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Century Dictionary and Cyclopedia
    • n quinizarin A red, or yellowish-red, crystalline substance, C6H4(CO)2C6H2(OH)2 or 1,4-dihydroxyanthraquinone, made by heating together phthalic anhydrid and hydroquinone; also in other ways. It gives blue solutions with alkalis. It melts at 192–193° C.
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Webster's Revised Unabridged Dictionary
Hydroquin,one + alizarin,