cross hair, cross wire – either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration; “he had the target in his cross hairs”
eyepiece, ocular – combination of lenses at the viewing end of optical instruments
network – a system of intersecting lines or channels; “a railroad network”; “a network of canals”
a. Hardened in wrongdoing or wickedness; stubbornly impenitent: “obdurate conscience of the old sinner”(Sir Walter Scott).
b. Hardened against feeling; hardhearted: an obdurate miser.
2. Not giving in to persuasion; intractable. See Synonyms at inflexible.
[Middle English obdurat, from Late Latin obdrtus, past participle of obdrre, to harden, from Latin, to be hard, endure : ob-, intensive pref.; see ob- + drus, hard; see deru- in Indo-European roots.]
t
l)
ticulum, diminutive of r
b
d
-r
t, -dy
r
tus, past participle of obd