• A ring-shaped organic compound consisting of an oxygen atom bonded to two other atoms, usually of carbon, that are already bonded to each other.
  • A compound containing such a structure.
  • Any of a <xref>class</xref> of <xref>organic</xref> <xref>compound</xref>, <xref>cyclic</xref> <xref>ethers</xref>, having a three-membered <xref>ring</xref>; they are prepared by the selective <xref>oxidation</xref> of <xref>alkenes</xref> or by ring-closure of <xref>halohydrins</xref>; used to make <xref>plastics</xref>.
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