a. [f. L. fīl-um thread + -AR.] Of or pertaining to a thread; esp. in filar micrometer, microscope, one having threads or wires across its field of view.
1874. Knight, Dict. Mech., Filar-micrometer.
1879. Newcomb & Holden, Astron., 90. By the filar micrometer we can determine the distance apart in seconds of arc of any two stars A and B.
1884. Knight, Dict. Mech., 333/1. Filar Suspension. (Electricity.) Said of a magnetic needle, which is suspended by a filament of silk, as distinguished from one poised on the point of a stud.
