Meaning of VERNIER in English

VERNIER

n. a small movable graduated scale for obtaining fractional parts of subdivisions on a fixed main scale of a barometer, sextant, etc.

Phrases and idioms:

vernier engine an auxiliary engine for slight changes in the motion of a space rocket etc.

Etymology: P. Vernier, Fr. mathematician d. 1637

Oxford English vocab.      Оксфордский английский словарь.