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Entry 1 sense Webster, 1913

pecs

/(pĕks)/ · IPA /pɛks/
01 n. pl. The pectoral muscles; -- a contraction used by body-building and health enthusiasts. Used similarly to abs and delts.
  1. 1.
    The pectoral muscles; -- a contraction used by body-building and health enthusiasts. Used similarly to abs and delts.(Anat.) [informal] See: abs, delts