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arm

noun [C] (OF LAND/WATER)
 
 
/ɑːm/ US  /ɑːrm/

Definition

An arm of land or water is a long, thin part of it that is joined to a larger area.Bays and gulfsCoasts and beachesPromontories and peninsulas
(Definition of arm noun (OF LAND/WATER) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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