aftertaste
noun [ C usually singular ] uk/ˈɑːf.tə.teɪst/ us/ˈæf.tɚ.teɪst/
（饮食等在口中留下的）后味，余味，回味
the taste that a particular food or other substance leaves in your mouth when you have swallowed it
The medicine left an unpleasant aftertaste. 药服下后在口中留下了一股怪味道。