cross wire

or crosswire

noun

, Optics.

1. cross hair ( def 1 ).

Word History and Origins

Origin of cross wire¹

First recorded in 1865–70

Example Sentences

As the float approaches AA1, the observer at B keeps it on the cross wire of his instrument.

From Project Gutenberg

B now points his instrument in the direction BF, and A keeps the float on the cross wire of his instrument.

From Project Gutenberg

Near the cross wire end, hanging from the pipe, was a solid plug, cylindrical in section.

From Project Gutenberg

All being at rest the number on the scale marked by the cross wire of the telescope was 572.

From Project Gutenberg

A cross wire in the microscope tells when it is accurately abreast of the line below it.

From Project Gutenberg