a living thing that has (or can develop) the ability to act or function independently

hairlike structure especially on the surface of a cell or microorganism

a living organism characterized by voluntary movement

(botany) a living organism lacking the power of locomotion

(biology) a single-celled microorganism (especially a flagellate protozoan)

harmless microorganisms (as Escherichia coli) that inhabit the intestinal tract and are essential for its normal functioning

(virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein

organisms that typically reproduce by asexual budding or fission and whose nutritional mode is absorption or photosynthesis or chemosynthesis

(microbiology) single-celled or noncellular spherical or spiral or rod-shaped organisms lacking chlorophyll that reproduce by fission; important as pathogens and for biochemical properties; taxonomy is difficult; often considered to be plants

hairlike structure especially on the surface of a cell or microorganism

(of a microorganism) extremely infective

(of spores or microorganisms) capable of movement

(of spores or microorganisms) not capable of movement

a living organism characterized by voluntary movement

(botany) a living organism lacking the power of locomotion