Definition of grilse noun from the Oxford Advanced Learner's Dictionary

 

grilse

 noun
noun
BrE BrE//ɡrɪls//
 
; NAmE NAmE//ɡrɪls//
 
Fish
 
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a salmon (= a type of fish) that has returned to a river or lake after spending one winter in the sea See related entries: Fish Word Origin late Middle English: of unknown origin.
See the Oxford Advanced American Dictionary entry: grilse