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.
I grew up knowing the tallest building in the world as the Sears Tower in Chicago. Now the 108-story sky scraper is called the Willis Tower, and it's no longer the tallest building in the world. (That title, for the time being, belongs to the Burj Khalifa in Dubai, which stretches more than half a mile into the sky.)