Groove of nail matrix

What is Groove of nail matrix?

Groove of nail matrix definition and meaning on Dictionary terms:
noun
WalA.ter [wawl-ter; German vahl-tuha??r] /E?wE?la??tE?r; German E?vE?la??tE?r/, 1883a??1969, German architect, in the U.S. from 1937.

 

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