*sleg-

"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").

1580s, of a line of verse, "wanting an unaccented syllable in the last foot," from Late Latin catalecticus, from Greek katalektikos "leaving off," from kata "down" (see cata-) + legein "to leave off, cease from," from PIE root *sleg- "be slack, be languid." A complete line is said to be acatalectic.