The amount of vertical space above a person's head, especially in a vehicle, room, or building.
From 'head' (the upper part of the body) and 'room' (space, from Old English 'rum'). This compound became important in 20th-century architecture and automotive design.
Architects discovered that people feel claustrophobic if ceilings are too low—studies show that rooms with just 7 feet of headroom feel different psychologically than 9-foot ceilings, even though you won't hit your head in either.
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