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Webster 1913 Edition

Noun.

[LL.

malleatio

: cf. OF.

malléation

The act or process of beating into a plate, sheet, or leaf, as a metal; extension by beating.

Noun.

The act of beating into a plate or leaf, as a metal; extension by beating.

malleation ‎(plural malleations)

The act or process of beating into a plate, sheet, or leaf, as a metal; extension by beating.
A hammering movement of the hands against the thighs, a form of tic.