Medical Definition of dorsiflexion. : flexion in a dorsal direction; especially : flexion of the foot in an upward directionâcompare plantar flexion.
Willis Tower. The Willis Tower, built as and still commonly referred to as Sears Tower, is a 108-story, 1,450-foot (442.1 m) skyscraper in Chicago, Illinois, United States.
It's official: World Trade Center is USA's tallest building. An expert committee has declared New York's new World Trade Center tower the tallest building in the United States. The ruling ends the 40-year reign at the top by Chicago's Willis Tower.