- Calcium oxid, CaO; burned lime; lime not yet slaked with water.
- Calcium oxide; unslacked lime; -- so called because when wet it develops great heat. See 4th <xref urlencoded="lime">lime</xref>, 2.
- <xref>lime</xref>, (<xref>calcium oxide</xref>), produced by heating <xref>limestone</xref>; on treatment with water it gives <xref>slaked lime</xref>
- To treat with quicklime.
- a white crystalline oxide used in the production of calcium hydroxide