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