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atomic mass▼◼◼◼[UK: ə.ˈtɒ.mɪk mæs] [US: ə.ˈtɑː.mɪk ˈmæs]
atomic weight [atomic weights]▼◼◼◼noun[UK: ə.ˈtɒ.mɪk weɪt] [US: ə.ˈtɑː.mɪk ˈweɪt]
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