: a caustic highly infusible solid that consists of calcium oxide often together with magnesium oxide, that is obtained by calcining forms of calcium carbonate (such as shells or limestone), and that is used in building (as in mortar and plaster) and in agriculture
called alsoquicklime
b
: a dry white powder consisting essentially of calcium hydroxide that is made by treating quicklime with water
: the small globose yellowish green fruit of a widely cultivated spiny tropical Asian citrus tree (Citrus aurantifolia) with a usually acid juicy pulp used as a flavoring agent and as a source of vitamin C