1. A chest muscle or organ: "He tried every day to exercise and to build his pectorals."
2. Something that is worn on the chest as a decoration or ornament.
3. A covering or protecting for the breast or chest.
4. A medicine for chest or respiratory disorders; especially the lungs.
5. Relating to, or good for, diseases of the chest or lungs; as, a pectoral remedy.
6. Having the breast conspicuously colored; such as, the pectoral sandpiper.
7. A reference to a pectoral fin on a fish.