(photography, historical) A photographic plate measuring 3¼ by 4¼ inches.

(photography, historical) A photographic plate measuring 4¾ by 6½ inches in Britain (4¼ by 5½ in the US).

(astronomy) a body comparable to a planet, but not a planet, such as a dwarf planet or a planetary-mass moon

A plate or block above or below a carriage-reach, at the kingbolt.

To behave conservatively and discreetly.

Alternative form of mustard plaster

(rare) Fear of planes, especially fear of air-travel on planes.

Physically unattractive (of a person). / Not beautiful, distinctive, or remarkable in appearance. / Not too pretty, or too ugly; normal.

Synonym of sweat one's guts out

The bent plate that forms the arch of the furnace in locomotive steam boilers.