from the GNU version of the Collaborative International Dictionary of English
- adj. Of, pertaining to, or designating, a complex ketonic acid, C5H6O3, obtained as a white crystalline substance; -- so called because once supposed to contain a peculiar radical of four carbon atoms. Called also acetyl-acrylic acid.
from The Century Dictionary and Cyclopedia
- Pertaining to a compound with four carbon atoms.
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