形容詞 filar:

1. related to or having filaments (especially across a field of view as in the eyepiece of a telescope)

fi.lar

adj.（形容詞）
Of or relating to a thread.
線的，絲的：線的，與線有關(guān)的
Having fine threads across the field of view for measuring small distances, as in the eyepiece of a telescope.
視域里畫有絲紋的：有用于測量小距離的通過視野的細(xì)線的，如在望遠(yuǎn)鏡的目鏡片中

來源：
From Latin folum [thread] * see g who-
源自 拉丁語 folum [線] *參見 g who-