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| a muscular, membranous or ligamentous wall separating the thoracic or chest cavity from the abdominal cavity in mammals |
| one member of the first seven pairs of ribs that are attached in humans to the sternum |
placentation plac·en·ta·tion (plās'ən-tā'shən)
n.
Formation of a placenta in the uterus.
The type or structure of a placenta.