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
Word origin
C18: named after Paul Vernier (1580–1637), French mathematician, who described the scale
vernier in American English
(ˈvɜrniər; ˈvɜrnɪr)
noun
1.
a short graduated scale that slides along a longer graduated instrument and is used to indicate fractional parts of divisions, as in a micrometer
: also vernier scale
2.
any device that makes possible a finer setting of a tool or measuring instrument
adjective
3.
of or fitted with a vernier
Word origin
after Pierre Vernier (1580-1637), Fr mathematician who invented it