The crumbly residue left after a mineral or metal has been calcined or roasted.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "calx" in a sentence
"A calx is a smartstone, a pebble used for calculating."
"The theory thought of the re-formation of a metal from its calx, that is, the earthy substance which remains after combustion, as the combination of two things to produce one, apparently homogeneous, substance."
"Gravel is usually understood to mean calculi, (from the old word calx) a limestone, or little sand-like stones, which pass from the kidneys through the ureters into the bladder."