(UK, informal) The head; the part of the body of an animal or human which contains the brain, mouth and main sense organs. / (UK, informal) The head as the seat of mental capacity or intellect.

(idiomatic) To derive excitement, entertainment, or pleasure from.

Of ecclesiastical property: placed under the control or management of a layperson.

(organic chemistry) The aliphatic dialdehyde pentane-1,5-dial, a toxic liquid with a pungent odor.