Usage: usually capitalized M
Etymology: after Mercury, Roman god of commerce, from Latin Mercurius
: a line on the hand that usually begins on the Mount of Mercury and often runs straight down the hand to the rascettes and that is usually held by palmists to indicate the condition of the liver and the digestive system and the presence of maladies or physical and mental qualities associated with them — called also Hepatica, Hepatic line, line of Health, line of Liver ; see palmistry illustration