noun
Usage: usually capitalized W
Etymology: after William H. Wollaston died 1828
: a very fine usually platinum wire used for cross hairs in telescope eyepieces
noun
Usage: usually capitalized W
Etymology: after William H. Wollaston died 1828
: a very fine usually platinum wire used for cross hairs in telescope eyepieces
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012