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 nucle- motor end plate father fixation galvanocautery tympanic antrum prazosin hydrochloride -orphan infantile spinal muscular atrophy glow curve