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.
Chicago, the third-largest city in the United States, is home to 1,315 completed high-rises, 44 of which stand taller than 600 feet (183 m). The tallest building in the city is the 108âstory Willis Tower (formerly the Sears Tower), which rises 1,451 feet (442 m) in the Chicago Loop and was completed in 1974.