calx n : a white crystalline oxide used in the production of calcium hydroxide [syn: calcium oxide, quicklime, lime, calcined lime, fluxing lime, unslaked lime, burnt lime] [also: calces (pl)]
EtymologyFrom calx ‘lime’.
Etymology 1Ancient Greek χάλιξ pebble
DeclensionThird declension; I-stem, base of 2 consonants (3:B2C).
Etymology 2Possibly from an extension of the Proto-Indo-European root *(s)kel- "to bend", whence also Greek σκέλος leg.
DeclensionSame as for Etymology 1.
Calx is a residual substance, sometimes in the form of a fine powder, that is left when a metal or mineral combusts or is calcinated due to heat.
Calx, especially of a metal, is now known as an oxide. According to the obsolete phlogiston theory, the calx was the true elemental substance, having lost its phlogiston in the process of combustion.
"Calx" is also sometimes used in older texts on artist's techniques to mean calcium oxide.
Calx is a Latin word that is also the root for Calcium.