amuse-gueule
Concise Oxford English Dictionary © 2008 Oxford University Press:
amuse-gueule /əˌmjuːzˈgəːl/ (also amuse-bouche /əˌmjuːzˈbuːʃ/)
▶noun (pl. amuse-gueules or same) a small savoury item of food served as an appetizer.
– origin Fr., lit. ‘amuse mouth’.
'amuse-gueule' also found in these Oxford entries:

