regurgitation
noun [ U ] biology specialized uk/rɪˌɡɜː.dʒɪˈteɪ.ʃən/ us/rɪˌɡɝː.dʒəˈteɪ.ʃən/
（食物）回流，反流，逆流
the act of bringing swallowed food back into the mouth
Vomiting is the regurgitation of partly digested food from the stomach to the mouth. 呕吐是部分消化的食物从胃部回流到口腔的过程。