What is the meaning of pseudopod?

It means "false foot." Some very simple creatures like amoebae extend portions of their bodies to touch things and the pull themselves along. (Imagine someone crawling under a blanket). The part that does the pulling is just like the rest of the body except for what it's currently doing. Scientists would say it's an "Undedicated Structure." So it's a sort of foot, but since it's not just a foot, it's a "false" one.