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1The anterior lobe of the foot in some molluscs, especially gastropods.
2A bone of the proximal or upper segment of the limb of a tetrapod (especially a reptile or amphibian), i.e. the humerus or femur; this segment of the limb.
Mid 19th century; earliest use found in Thomas Huxley (1825–1895), biologist and science educationist. From pro- + -podium.