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English definition of “deltoid”

deltoid

noun [C] uk   /ˈdel.tɔɪd/ ( also deltoid muscle) specialized us  
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.

deltoid

adjective uk   /ˈdel.tɔɪd/ specialized us  
shaped like a triangle: a deltoid ligament
(Definition of deltoid from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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