Definition of C–pillar
: either one of two support posts that connect a vehicle's roof to its body at the rear of the rear door in a four-door vehicle or at the rear of a two-door vehicle The 21⁄2-in.-shorter hood, the stretched out C-pillar and the elevation of the trunk … — Don Chaikin, Popular Mechanics, October 1999
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First Known Use of c–pillar
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