The white moon shape you see on your finger nail is actually called the nail
root. It is made of cells under the nail that also extend a little ways into
your finger. These cells produce the volume of the nail and the nail bed. It
looks white because the cells do not have any color pigments in them.
That's what it is if you're talking about the moon shaped thing.
What is that white arc shape at the bottom of your finger nail?
lunula
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