A white crystalline oxide used in the production of calcium hydroxide WordNet 3.0 & Open English WordNet

Calcium oxide, commonly known as quicklime or burnt lime, is a widely used chemical compound. Wikipedia

Lime is an inorganic material composed primarily of calcium oxides and hydroxides, usually calcium oxide and/or calcium hydroxide. Wikipedia

Calx is a substance formed from an ore or mineral that has been heated. Wikipedia

Inorganic materials containing calcium, usually calcium oxide or calcium hydroxide Wikipedia Disambiguation

Calcium oxide or hydroxide Wikidata

Any of various mineral and industrial forms of calcium oxide differing chiefly in water content and percentage of constituent such as silica, alumina and iron. OmegaWiki

A white powderous substance, CaO, normally made by heating calcium carbonate. Wiktionary

White powderous substance. Wiktionary (translation)

The substance which remains after a metal or mineral has been thoroughly burnt, once seen as being the essential substance left after the expulsion of phlogiston, but now recognised as being the metallic oxide (or, in some cases, the metal in a state of sublimation). Wiktionary

The substance which remains after a metal or mineral has been thoroughly burnt. Wiktionary (translation)

Any inorganic material containing calcium, usually calcium oxide (quicklime) or calcium hydroxide (slaked lime). Wiktionary

Inorganic material containing calcium. Wiktionary (translation)

Calcium oxide, which is produced by heating (calcining) limestone and gives slaked lime on treatment with water. Wiktionary

Calcium oxide. Wiktionary (translation)