plural of plainful

(geography) The relatively flat region of North American grasslands east of the Rocky Mountains, from Alberta, Saskatchewan, and Manitoba in the north, to Texas in the south.

(cryptography) Text or any data that is to be encrypted (as opposed to ciphertext).

(computing) Consisting only of plain text.

Alternative spelling of plainsong

Alternative spelling of floodplain

(geography) A plain formed by the deposition of sediment from the periodic flooding of a river.

Paper that has no ruled lines or other markings on it. / Non-glossy photographic paper.

The Apache peoples living primarily in Oklahoma.

The now-extinct Southern Athabascan language spoken by the Plains Apache people.