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English definition of “deltoid”

deltoid

noun [C] /ˈdel.tɔɪd/ (also deltoid muscle) specialized
a muscle in the shoulder , shaped like a triangle and used for lifting the arm : Always stretch your deltoids after lifting weights . The deltoid muscle lifts the arm sideways .
(Definition of deltoid noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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