noun
also lue·ders' line ˈlü]də(r)z-, ˈlē]
Usage: usually capitalized 1st L
Etymology: after W. Lüders fl 1859 German scientist, its discoverer
: a line or any of a definite system of line markings appearing on the smooth surface of tough material (as metal) strained beyond its elastic limit and caused by flow of the material