bariatric surgery
noun [ U or C ] medical specialized uk/bær.iˌæt.rɪk ˈsɜː.dʒər.i/ us/ber.iˌæt.rɪk ˈsɝː.dʒər.i/ (also weight-loss surgery)
减肥手术（缩小胃容量以减少食量）
an operation that makes the stomach smaller so that less food can be eaten and digested