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.
The Willis Tower is the 13th tallest building in the world, and the 2nd tallest building in the United States. The building, which is located in Chicago, Illinois, is a popular tourist destination as well, attracting over one million visitors on its observation deck annually.