Source : Webster's Revised Unabridged Dictionary (1913)

Pectus \Pec"tus\, n.; pl. {Pectora}. [L., the breast.]
   (Zo["o]l.)
   The breast of a bird.

Source : WordNet®

pectus
     n : the part of the human body between the neck and the
         diaphragm or the corresponding part in other vertebrates
         [syn: {thorax}, {chest}]