falseface

plural falsefaces

1. A mask covering the face.

   1852, State Cabinet of Natural History (N.Y.), University of the State of New York. Board of Regents, Annual report of the Regents of the University Each one wore a mask or falseface, a tattered blanket over his shoulders, and carried a turtle shell rattle in his hand.

   1 more example

   When the 'Hlem'mosona and the warrior reach the ceremonial chamber, the latter, who is a very aged man, dons a queer-looking mask, entirely unlike those worn by the personators of the gods but similar to our common falseface.

   1904, John Wesley Powell, Matthew Williams Stirling, Smithsonian Institution. Bureau of American Ethnology. Annual report, page 471