drystone wall
noun/ˌdraɪstəʊn ˈwɔːl/
/ˌdraɪstəʊn ˈwɔːl/
(British English)- a stone wall built without mortar (= a substance used to hold building materials together) between the stones
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drystone wall
Definition of drystone wall noun from the Oxford Advanced Learner's Dictionary