filar

enUK

fi·lar

F0116800 (fī′lər)adj.1. Of or relating to a thread.2. Having fine threads across the field of view for measuring small distances, as in the eyepiece of a telescope.
[From Latin fīlum, thread; see gwhī- in Indo-European roots.]

filar

(ˈfaɪlə) adj1. of thread2. (General Physics) (of an optical instrument) having fine threads across the eyepiece forming a reticle or set of cross wires[C19: from Latin fīlum thread]

fi•lar

(ˈfaɪ lər)

adj. 1. of or pertaining to a thread or threads. 2. having threads or the like. [1870–75; < Latin fīl(um) a thread + -ar1]
Thesaurus
Adj.1.filar - related to or having filaments (especially across a field of view as in the eyepiece of a telescope); "a filar eyepiece"