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.
Name changes for tall buildings aren't out of the ordinary. 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. Tucson's tallest high-rise, with a height of 330 feet, doesn't reach quite so far into the heavens.