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| originating outside the anatomical limits of certain muscles or nerves |
| a semilunar valve between the pulmonary artery and the right ventricle of the heart that prevents the blood from flowing back into the right ventricle |
asternal a·ster·nal (ā-stûr'nəl, ə-stûr'-)
adj.
Not related to or connected with the sternum, as a rib.
Lacking a sternum.