Pronunciation: (u-mē'bu), [key]
—pl. -bas, -baePronunciation: (-bē). [key]
1. any of numerous freshwater, marine, or parasitic one-celled protozoa of the order Amoebida, characterized by a granular nucleus surrounded by a jellylike mass of cytoplasm that forms temporary extensions, or pseudopodia, by which the organism moves, engulfs food particles, and forms food vacuoles.
2. a protozoan of the genus Amoeba, inhabiting bottom vegetation of freshwater ponds and streams: used widely in laboratory studies. Also,amoeba.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.