Noun breastbone has 1 sense
  1. sternum, breastbone - the flat bone that articulates with the clavicles and the first seven pairs of ribs
    --1 is a kind of bone, os
    --1 is a part of thorax, chest, pectus; axial skeleton
    --1 has parts: gladiolus, corpus sternum; manubrium; xiphoid process
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