Baseplate

bedplate.
Dentistry.

a sheet of plastic material for making trial denture plates.
the portion of a denture in contact with the jaw.

Metallurgy. a plate of metal to be clad with another metal.
Historical Examples

The following morning, under the frightened gaze of his guards, Jason tackled the underside of the baseplate.
The Ethical Engineer Henry Maxwell Dempsey

baseplate base·plate (bās’plāt’)
n.

The portion of an artificial denture in contact with the jaw.

A temporary form representing the base of a denture and used to help establish jaw relationships and the arrangement of teeth.

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