etymology 1 air + head; having one's head filled with air instead of grey matter.
- (pejorative) A silly, foolish or unintelligent person.
etymology 2 air + head, by analogy with beachhead, bridgehead, railhead.
- A landing area for aircraft for supplying an operation, military or other, usually temporary.
- (military) An area of hostile territory that has been seized by paratrooper or helicopter-based troop to ensure the further landing of troops and/or materiel.