Designed for use in mathematics; spec. used in drawing geometrical figures. Esp. in mathematical instrument.

A mathematical instrument used in the construction of dials, having the form of a scalene, right-angled triangle.

Any of various instruments for measuring angles and heights; spec. (a) a nonius quadrant (see nonius, n.) (now historical and rare); (b) a device in…

A mathematical instrument, invented by Thomas Hood (see quot. 1598) and improved by Edmund Gunter, used for the mechanical solution of various…

A mathematical instrument for making all kinds of measurements; a pantometer.

An instrument or unit for performing arithmetical multiplications.

a mathematical instrument (see quot. 1879).