nonius
noun/ˈnəʊnɪəs/
Etymology Borrowed from Latin Nonius, the Latinised form of the name of its inventor, Pedro Nunes (1502-78), a Portuguese mathematician and geographer.
1
Astronomy, Mathematics, Natural sciences, Sciences A device for adjusting the accuracy of mathematical instruments, later superseded by the vernier.
- Well, of course, one must manipulate the various Screw-Settings precisely, read the Nonius, and an hundred other details besides I’d but bore you with,—1997, Thomas Pynchon, Mason & Dixon, New York: Henry Holt and Company, →ISBN, →OCLC, page 332:
- Derived terms
- nonius horopter