millimeter of mercury(n = noun.quantity) mm hg, torr - a unit of pressure equal to 0.001316 atmosphere; named after Torricelli;
is a kind of pressure unit
bichloride of mercury, cubic millimeter, dog mercury, dog's mercury, fulminate of mercury, fulminating mercury, herb mercury, herbs mercury, mercury, mercury barometer, mercury bichloride, mercury cell, mercury chloride, mercury fulminate, mercury poisoning, mercury program, mercury thermometer, millimeter, poison mercury, three-seeded mercury