barium meal
noun [ C or U ] UK uk/ˌbeə.ri.əm ˈmiːl/ us/ˌber.i.əm ˈmiːl/ (US barium swallow [ C or U ])
钡餐
a chemical, barium sulphate, that is swallowed by a person just before an X-ray is taken of their stomach and bowels, so that these organs can be seen clearly