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| the depression in the center of the surface of the abdomen indicating the point of attachment of the umbilical cord to the embryo; navel. |
| the basinlike cavity in the lower part of the trunk of many vertebrates, formed in humans by the innominate bones, sacrum, etc. |
achalasia ach·a·la·sia (āk'ə-lā'zhə)
n.
The failure of a ring of muscle fibers, such as a sphincter, to relax.