bréviumcommon nounEtymologyexpandfrom Latin brevis, 'short', due to its short half-life (a little over a minute).Definition1. Name given by its discoverers to uranium Xin, when they established by observing its stability that it was a new chemical element with atomic number 91. Its symbol was Bv. Its modern designation is 234mPa, as it is the metastable isomer of another isotope of the same atomic weight (but very unstable) of protactinium.flags.désuetchimieexpandLe brévium est un des isotopes métastables du protactinium.Synonym2}}Hyperonymprotactinium