Illustrated Companion to the Latin Dictionary/Calx

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

CALX. The same as LINEA ALBA; the chalked rope which marked the commencement and boundary of a race-course in the Circus; but this term is mostly used in a figurative sense, to indicate the end of anything, especially of life, the course and casualties of which are often typified by the race, its chances, changes, and accidents. Cic. Sen. 23. Id. Tusc. i. 8.