SYN: pes planus.
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1) a condition in which the arch of the instep is flattened so that the entire sole rests upon the ground
2) a foot affected with flatfoot
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flat·foot (flatґfoot) a condition in which one or more of the arches of the foot have been lowered and flattened out; called also pes planovalgus, pes planus, and pes valgus.Medical dictionary. 2011.