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| the bone of the lower jaw. |
| the depression in the center of the surface of the abdomen indicating the point of attachment of the umbilical cord to the embryo; navel. |
| brain wave | |
| —n | |
| alpha rhythm beta rhythm See also delta rhythm any of the fluctuations of electrical potential in the brain as represented on an electroencephalogram. They vary in frequency from 1 to 30 hertz | |
brain wave n.
A rhythmic fluctuation of electric potential between parts of the brain, as seen on an electroencephalogram.