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.
Designed by the architectural firm Skidmore, Owings & Merrill for Sears, Roebuck & Company, the building was completed in 1973 and has since become one of the most recognizable landmarks in the Chicago skyline and in the world. More information on Willis Tower can be found at http://www.willistower.com/ .