Definition of Welsh rabbit from the Oxford Advanced Learner's Dictionary

 

Welsh rabbit

 
BrE
 
; NAmE
 
(also Welsh rarebit
BrE
 
; NAmE
 
)
 
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a dish eaten as a small meal or as part of a meal, consisting of bread with cheese on it cooked under heat until the cheese melts. The origin of its name is not clear, and it is often simply called 'cheese on toast'.