pseudopodiumPronunciation: /ˌsjuːdə(ʊ)ˈpəʊdɪəm/Definition of pseudopodium noun (plural pseudopodia /-dɪə/) Biology a temporary protrusion of the surface of an amoeboid cell for movement and feeding. Origin: mid 19th century: modern Latin, from pseudo- + podiumpseudopodium in other Oxford dictionaries Definition of pseudopodium in the US English dictionary