mass number
plural of mimosa
plural of geopolitical zone
(medicine) A preparation of barium sulfate (a radioopaque compound) which the patient ingests for the purpose of producing clear radiographs of the esophagus, stomach, and duodenum.
(physics, chemistry) The total number of protons and neutrons in an atomic nucleus. Symbol: A
質量数（記号A）は原子の陽子と中性子の合計であり、その同位体を区別するのに役立つ。
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