Etymology
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vernier (n.)

device for making precise measurements, 1766, from name of inventor, French mathematician Pierre Vernier (1580-1637), who described it in 1631.

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Definitions of vernier
1
vernier (n.)
a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale;
Synonyms: vernier scale
2
Vernier (n.)
French mathematician who described the vernier scale (1580-1637);
Synonyms: Paul Vernier
From wordnet.princeton.edu