Variant ofcord, with spelling alteration due toLatinchorda(“cord”), ultimately fromAncient Greekχορδή(khordḗ,“string of gut, the string of a lyre”). No relation toFrenchaccord(“chord”) and its derivations.
1941 September, “The Why and the Wherefore: Curves”, inRailway Magazine, page430:
The simplest method of calculating the radius of a curvein situ is to measure the versine; in railway practice this is done by extending a tape 66 ft. (1 ch.) long in a straight line orchord between two points on the periphery of a curve, and then measuring the maximum distance of the rail from thechord at the centre of the 66 ft. The radius in chains is found by dividing the versine in inches into 99. Thus if a versine measures 3 in., the radius will be 33 ch.
1667,John Milton, “(please specify the page number)”, inParadise Lost.[…], London:[…] [Samuel Simmons], and are to be sold by Peter Parker[…];[a]nd by Robert Boulter[…];[a]nd Matthias Walker,[…],→OCLC; republished asParadise Lost in Ten Books:[…], London: Basil Montagu Pickering[…],1873,→OCLC:
Instruments that made melodious Chime Was heard, of Harp and Organ; and who mov'd Their Stops and Chords was seen