The American Heritage® Dictionary of the English Language, 4th Edition
n. A plural of calx.
the GNU version of the Collaborative International Dictionary of English
noun-plural. See calx.
The Century Dictionary and Cyclopedia
n. Plural of calx.
Word Usage
"The colours used in Enamel, are all metallic calces, mixed and melted with certain proportions of a vitreous substance, which, in the instant of fusion, discovers the colours and fixes them to the Enamelled Plate."