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.
Must-see in Chicago. Of all the landmarks, the Willis Tower (formerly the Sears Tower) is a must for any visitor to the city. Another must-see is the Museum Campus, which includes the Field Museum, Shedd Aquarium and Adler Planetarium.