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.
Tallest Buildings In The U.S. Willis Tower, Chicago (1973) - One of the Windy City's most iconic tourist attractions, this 1,353-foot building contains 25 miles of plumbing, 1,500 miles of electric wiring, 80 miles of elevator cable, and 145,000 light fixtures, according to its website.