n. pl. calx·es or cal·ces (kălsēz′)
1. The crumbly residue left after a mineral or metal has been calcined or roasted.
2. See calcium oxide.
[Middle English, from Latin, lime, limestone, pebble, from Greek khalix, pebble.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.