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British Dictionary definitions for pectoral muscle

pectoral muscle

noun
  1. either of two large chest muscles (pectoralis major and pectoralis minor), that assist in movements of the shoulder and upper arm
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012