noun
: one of the fine wires or spider lines mounted as a reticle in the focus of the eyepiece of optical instruments and used as a reference line in the field or for marking the instrumental axis
noun
: one of the fine wires or spider lines mounted as a reticle in the focus of the eyepiece of optical instruments and used as a reference line in the field or for marking the instrumental axis
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012