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

 

groyne

 noun
(especially US English groin)noun
BrE BrE//ɡrɔɪn//
 
; NAmE NAmE//ɡrɔɪn//
 
Coastlines and the sea
 
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a low wall built out into the sea to prevent it from washing away sand and stones from the beach See related entries: Coastlines and the sea Word Origin late 16th cent.: from dialect groin ‘snout’, from Old French groign, from late Latin grunium ‘pig's snout’, from Latin grunnire ‘to grunt’.