Medical Definition of foot
plural feet \ˈfēt\play also foot
1: the terminal part of the vertebrate leg upon which an individual stands
2: any of various units of length based on the length of the human foot; especially : a unit equal to 1⁄3 yard or 12 inches or 30.48 centimeters—plural foot used between a number and a noun <a 10-foot pole>; plural feet or foot used between a number and an adjective <6 feet tall>
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