The French word for foot is PIED (pronounced approximately pee-ay.) Being a masculine noun it would be le pied (the foot) or un pied (a foot.) unlike the English foot/ feet, the French word doesn't have a special plural form, so the plural would be les pieds (the feet.)
Extra bit of trivia: a pied-a-terre (literally "foot on the ground") is a term also used in English for a small flat or room that you keep just for occasional visits.
Extra bit of trivia: a pied-a-terre (literally "foot on the ground") is a term also used in English for a small flat or room that you keep just for occasional visits.