from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A five-membered heterocycle having three carbon atoms, one oxygen atom, one nitrogen atom and two double bonds; the 1,3- isomer is aromatic
from The Century Dictionary and Cyclopedia
- n. The unknown mother- substance, C3H4ON, of compounds containing a ring composed of three carbon atoms, one nitrogen, and one oxygen atom.
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