1) Musculus pectoralis 2) Pecs 3) Pectoral 4) Pectoral muscle 5) Skeletal muscle 6) Striated muscle 1) Pecs 
the primary muscles of the chest
(pek″tә-ra´lis) (-ral´is) Latin word meaning thoracic; a term used in anatomy.
pectoralis Either of two muscles on each side of the upper and anterior part of the thorax. The action of the larger (pectoralis major) assists in drawing the shoulder forward and rotating the arm inward, and the action of the smaller (pectoralis minor) assists in drawing the shoulder downward and forward.
Large, powerful flight muscle of birds that attaches to the sternum. The pectoralis has two portions
pectus, chest.
adjective, Latin pectoris = of the front of the chest.