A Fresnel zone plate.

To coat a metal surface with a thin layer of silver, often electrolytically.

To plate a metal with a layer of chromium

plated with a layer of chromium

present participle of chromium plate

The application of a layer of chromium onto the surface of a metal

A metal plate affixed to a doorjamb that holds the door closed when the door bolt is extended into a hole, protecting the jamb against friction from the bolt.

Alternative spelling of collection plate

A plate or other container passed among the worshipers attending a Christian church service, into which donations of money are placed.

A plastic square consisting of a large letter L, placed on the front and rear of a vehicle to indicate that the driver is a learner. / (by extension, informal) The condition of being a novice or learner.