n. etc.n. [capitalized] A genus of microscopic rhizopodous Protozoa, of which A. diffluens, common in all fresh-water ponds and ditches, is the type.n. An animal of the genus Amœba.n. Any single cell or corpuscle of one of the higher animals; a cell regarded as itself an animal, and an individual of the morphological grade of development of an amœboid organism.