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(now chiefly historical) 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).
ome ladies apply to what are termed coſmetics under various names, which crowd the newspapers. Of theſe the white has deſtroyed the health of thouſands; a calx, or magiſtery, of biſmuth is ſuppoſed to be ſold in the ſhops for this purpoſe; but it is either, I am informed, in part or entirely white lead or ceruffa. […] The real calx of biſmuth would probably have the ſame ill effect.
2004, Robert E Schofield, The Enlightened Joseph Priestley, Pennsylvania State University, page 179:
The regeneration of mercury from its calx, without addition of any other substance, had been a chief example for anti-phlogiston, but that could, as Kirwan showed, be explained in a way consistent with phlogiston theory.
In the Eton College wall game, an area at the end of the field where a shy can be scored by lifting the ball against the wall with one's foot.
Translations
substance which remains after a metal or mineral has been thoroughly burnt
The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.
^ De Vaan, Michiel (2008) “calx, -cis 'lime, limestone'”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 86
^ De Vaan, Michiel (2008) “calx, -cis 'heel; hoof'”, in Etymological Dictionary of Latin and the other Italic Languages (Leiden Indo-European Etymological Dictionary Series; 7), Leiden, Boston: Brill, →ISBN, page 86
^ Schrijver, P. (2024). The Reflexes of the Proto-Indo-European Laryngeals in Latin. Netherlands: Brill, p. 207
Further reading
(limestone) “calx”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
(heel) “calx”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“calx”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
calx in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
calx in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.