(countable) A surname transferred from the common noun referring to someone who lived in or worked in a castle / (UK, rail transport) Castle class, a class of steam locomotives used on the GWR

A surname.

plural of castleful

Enough to fill a castle.

Synonym of bouncing castle

The first fast-food hamburger chain and one of the oldest American fast-food restaurant chains, known for its Slyder, a small square burger.

A nut with rounded extensions projecting past the nut's opening. A cotter pin is inserted through a hole in the bolt and bent around the castle nut's projections to lock the nut in place.

plural of castle nut

plural of castle in the air

(idiomatic) A desire, idea, or plan that is unlikely to ever be realized; a visionary project or scheme; a daydream, an idle fancy, a near impossibility.