Definitions
1.nounA pectoral fin.
2.nounProtective armor for a horse's breast.
3.nounA covering or protection for the breast.
4.nounA breastplate, especially that worn by the Jewish high priest.
5.nounA clasp, cross, or ornamental square of cloth etc. worn upon the breast.
6.nounA medicine for diseases of the chest organs, especially the lungs.
7.adjectiveOf or pertaining to the breast, or chest."the pectoral muscles"
8.adjectiveRelating to, or good for, diseases of the chest or lungs.
9.adjectiveHaving the breast conspicuously colored."the pectoral sandpiper"