"sado-masochism, sexuality that fetishizes violence and pain," 1900, Modern Latin, coined in German in 1892 by German doctor and paranormalist Albert von Schrenck-Notzing (1862-1929) from Greek algos "pain" (see -algia) + lagneia "lust," from lagnein "to lust," from PIE root *sleg- "be slack, be languid."