a style of automobile roof
a term for a rigid, rather than canvas, automobile An automobile is a wheeled vehicle that carries its own engine
Two-door or four-door passenger car with a fixed roof and no centre (or B-pillar) between the side windows. It also means a detachable, non-folding turret fitted in place of the folding hood.
a car designed to resemble a convertible in looks and feel but without a removable top. Hardtops do not have the fixed post between the side windows. Photo
A hardtop is a term for a rigid, rather than canvas, automobile roof. It has been used in several contexts: detachable hardtops, retractable hardtop roofs, and the so-called convertible hardtop body style.