D-pil·lar | \ ˈdē-ˈpi-lər 
\
\variants:
or less commonly D-post \ ˈdē-ˈpōst \
\ plural D-pillars also D-posts
Definition of D-pillar
: either one of two support posts that connect a vehicle's roof to its body at the rear of a long vehicle (such as a station wagon)
The wide D-pillar creates a large blind spot for lane changes and backing out of parking spots.— Mark Phelan, Detroit Free Press, 14 Mar. 2013
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Time Traveler for D-pillar
The first known use of D-pillar was in 1979
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