The Collaborative International Dictionary
Mesopodium
Mesopodium \Mes`o*po"di*um\, n. [NL. See Mesopodiale.] (Zo["o]l.) The middle portion of the foot in the Gastropoda and Pteropoda.
Wiktionary
mesopodium
n. (context zoology English) The middle portion of the foot in the gastropods and pteropods.