Bible Dictionaries
Calipers

Webster's Dictionary

(n. pl.) An instrument, usually resembling a pair of dividers or compasses with curved legs, for measuring the diameter or thickness of bodies, as of work shaped in a lathe or planer, timber, masts, shot, etc.; or the bore of firearms, tubes, etc.; - called also caliper compasses, or caliber compasses.

Bibliography Information
Webster, Noah. Entry for 'Calipers'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​c/calipers.html. 1828.