noun \-ˌher\

: a very thin wire or thread that is seen when you look into a microscope, telescope, etc., and that is used for precisely viewing or aiming at something

Full Definition of CROSSHAIR

:  a fine wire or thread in the focus of the eyepiece of an optical instrument used as a reference line in the field or for marking the instrumental axis —used figuratively to describe someone or something being targeted as if through an aiming device having crosshairs <… in the crosshairs this political season — J. H. Alter>

First Known Use of CROSSHAIR

circa 1884


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