(dated) Mentally unsound; odd; crazy.

(medicine, computing) Informatics as applied to health and health care: the application of information science and information technology to health (that is, to its maintenance or improvement).

(idiomatic, transitive, colloquial) To clear one's mind; to think clearly.

A round, swollen, or large head. / (slang) An overly arrogant or conceited individual.

A hamlet in Farlam parish, City of Carlisle district, Cumbria, England (OS grid ref NY5857).

(rail transport) The use of three locomotives at the front, or head, of a train.

plural of heel stick

(China) A QR code identifying someone's risk level during the COVID-19 pandemic in the PRC, colored in green, yellow, or red in increasing danger.

Alternative form of the heart wants what it wants

plural of purple-headed yogurt slinger