a·moe·ba also a·me·ba (ə-mē'bə) n.
pl.a·moe·bas also a·me·bas or a·moe·bae also a·me·bae (-bē) Any of various one-celled aquatic or parasitic protozoans of the genus Amoeba or related genera, having no definite form and consisting of a mass of protoplasm containing one or more nuclei surrounded by a flexible outer membrane. It moves by means of pseudopods.
[New Latin, genus name, from Greek amoibē, change, from ameibein, to change; see mei-1 in Indo-European roots.] a·moe'bic (-bĭk) adj.