8 letters · 13 points in Scrabble
noun light yielded by the combustion of illuminating gas
originFrom the 1938 stage play Gas Light by the English playwright and novelist Patrick Hamilton (1904–1962), and its 1940 and 1944 film adaptations, in which a husband attempts to convince his wife and others that she is insane by manipulating small elements of their environment. For more details, see also Gaslighting § Etymology on Wikipedia.
Etymology from Wiktionary, CC BY-SA 3.0