|1.||a small movable scale running parallel to the main graduated scale in certain measuring instruments, such as theodolites, used to obtain a fractional reading of one of the divisions on the main scale|
|2.||an auxiliary device for making a fine adjustment to an instrument, usually by means of a fine screw thread|
|3.||(modifier) relating to or fitted with a vernier: a vernier scale; a vernier barometer|
|[C18: named after Paul Vernier (1580--1637), French mathematician, who described the scale]|
|Vernier (věr-nyā') Pronunciation Key
French mathematician and maker of scientific instruments, known especially for his invention of an auxiliary scale (named after him) used for obtaining a highly precise reading of a subdivision of an ordinary scale.
A small, movable auxiliary graduated scale attached parallel to a main graduated scale and calibrated to indicate fractional parts of the subdivisions of the larger scale. Vernier scales are used on certain precision instruments to increase accuracy in measurement.