- an alkaline earth oxide occurring in grayish white masses (quicklime); on exposure to the atmosphere it becomes converted into calcium hydrate and calcium carbonate (air-slaked lime); direct addition of water to calcium oxide produces calcium hydrate (slaked lime).
- Fruit of the lime tree, Citrus medica (family Rutaceae), which is a source of ascorbic acid and acts as an antiscorbutic agent.
[O.E. lim, birdlime]
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