Search millisecond (msec) millisecond (msec) /-sek′ənd/ [L, mille, thousand; ME, seconde, small part] , one thousandth (10−3) of a second. Tweet Telegram VK Random Words intravenous urography levobupivacaine hysteric lethargy meningomyelocele giardiasis cuneiform hemostatic forceps dento-, dent-, denta-, denti-, dentia- quality