from the GNU version of the Collaborative International Dictionary of English

  • adj. Of, pertaining to, or designating, a complex nitroso derivative of barbituric acid. It is obtained as a white or yellow crystalline substance, and forms characteristic yellow, blue, and violet salts.

from The Century Dictionary and Cyclopedia

  • Noting an acid (nitrosobarbituric acid), a yellowish compound, prepared by the action of potassium nitrite on barbituric acid. It forms lustrous, trimetric crystals.


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