From Longman Dictionary of Contemporary Englishpectoralspec‧to‧rals /ˈpektərəlz/ noun [plural] HBHyour chest muscles —pectoral adjective pectoral muscles
Examples from the Corpus
pectorals• James Walker wore a white tee shirt not quite large enough to accommodate his biceps and pectorals.• He seemed all forearms and pectorals and husky silence.• bulging pectorals• The male then took up guard, fanning the eggs constantly with his large pectorals and turning upside down to fan them as well.• Are there any tremors of dorsal or pectorals that could signify irritation from parasites?• He can see Zeke's pectorals slide under the chest hair.• The gills kneading quietly, and the pectorals. 