Any of the spiral-shaped bacteria that make up the genus Spirillum, which are aquatic except for one species that causes a type of rat-bite fever in humans. The term is used generally for any corkscrewlike species of bacteria (see spirochete). Spirilla are gram-negative (see gram stain) and move by means of tufts of flagella at each end
A genus of common motile microörganisms (Spirobacteria) having the form of spiral- shaped filaments
any flagellated aerobic bacteria having a spirally twisted rodlike form spirally twisted elongate rodlike bacteria usually living in stagnant water