from The Century Dictionary.
- Pertaining to a compound with four carbon atoms.
from the GNU version of the Collaborative International Dictionary of English.
- adjective (Chem.) 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
fourcarbon atoms. Called also acetyl-acrylic acid.
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