• WordNet 3.6
    • n pectoralis either of two large muscles of the chest
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Century Dictionary and Cyclopedia
    • n pectoralis One of the pectora] muscles, or muscles of the breast, passing from the thorax to the scapular arch or its appendage. In mammals there are commonly two of these muscles, in lower vertebrates commonly at least three; when two, they are the pectoralis major and the pectoralis minor. (See phrases below.) In birds an intermediate muscle, pectoralis medius, passes from the sternum to the humerus.
    • n pectoralis In ichthyology, a pectoral fin.
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In literature:

The present bird is about the size of Chladorhynchus pectoralis, and in plumage is nearly the same.
"Expedition into Central Australia" by Charles Sturt
A great, fan-shaped muscle, called the pectoralis major, lies on the chest.
"A Practical Physiology" by Albert F. Blaisdell
Rallus pectoralis 1 2 3.
"Voyage Of H.M.S. Rattlesnake, Vol. 2 (of 2)" by John MacGillivray
Pectoralis: relating to the breast.
"Explanation of Terms Used in Entomology" by John. B. Smith
E. Pectoralis major muscle.
"Surgical Anatomy" by Joseph Maclise
Tringa acuminata pectoralis, ii.
"Argentine Ornithology, Volume I (of 2)" by P. L. Sclater
Tringa acuminata pectoralis, ii.
"Argentine Ornithology, Volume II (of 2)" by P. L. Sclater

In news:

Pharyngoesophageal continuity was restored with a cervical flap vascularized by the prevertebral fascia, a pectoralis major myocutaneous flap , and a deltopectoralis flap .
Optimizing the visualization of the male breast on mammography: The pectoralis displaced view.
Pulled by the big pectoralis muscle, the wing, when fully extended, crashes through the air to create the thrust that keeps a bird airborne.