pectoralis minor

pectoralis

[pek-tuh-ral-is, -rey-lis, -rah-]
noun, plural pectorales [pek-tuh-ral-eez, -rey-leez, -rah-] . Anatomy.
either of two muscles on each side of the upper and anterior part of the thorax, the action of the larger (pectoralis major) assisting in drawing the shoulder forward and rotating the arm inward, and the action of the smaller (pectoralis minor) assisting in drawing the shoulder downward and forward.

Origin:
< Latin pectorālis; see pectoral

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pectoralis

noun
either of two large muscles of the chest [syn: pectoral
pectoralis minor

noun
a skeletal muscle that draws down the scapula or raises the ribs 
WordNet® 3.0, © 2006 by Princeton University.
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