Amoeba :: Amoeba (n.) A rhizopod. common in fresh water, capable of undergoing many changes of form at will. See Rhizopoda..
Amoebaeum :: Amoebaeum (n.) A poem in which persons are represented at speaking alternately; as the third and seventh eclogues of Virgil.
Amoebea :: Amoebea (n. pl.) That division of the Rhizopoda which includes the amoeba and similar forms.
Amoeboid :: Amoeboid (a.) Resembling an amoeba; amoeba-shaped; changing in shape like an amoeba.