Definitions for deltoid muscle
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Princeton's WordNet
deltoid, deltoid muscle, musculus deltoideus(noun)
a large triangular muscle covering the shoulder joint and serving to abduct and flex and extend and rotate the arm
Wiktionary
deltoid muscle(Noun)
A triangular muscle on the human shoulder.
Origin: Short for deltoideus + muscle. Previously the deltoideus muscle and musculus deltoideus.
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"deltoid muscle." Definitions.net. STANDS4 LLC, 2013. Web. 18 May 2013. <http://www.definitions.net/definition/deltoid muscle>.