1. (n.) A spore provided with one or more slender cilia, by the vibration of which it swims in the water. Zoospores are produced by many green, and by some olive-brown, algae. In certain species they are divided into the larger macrozoospores and the smaller microzoospores. Called also sporozoid, and swarmspore.

2. (n.) See Swarmspore.

Euglena adenovirus aerobe aerobic bacteria amoeba anaerobe anaerobic bacteria animalcule bacillus bacteria bacterium bug coccus colon bacillus diatom disease-producing microorganism dyad echovirus enterovirus filterable virus flagellate fungus germ gram-negative bacteria gram-positive bacteria microbe microorganism microspore microzoa mold monad nematode nonfilterable virus paramecium pathogen picornavirus protozoa protozoon reovirus rhinovirus rickettsia salmonella saprophyte spirillum spirochete spore sporozoon staphylococcus streptococcus tetrad triad trypanosome vibrio virus volvox vorticellum zoospore