capitalized: a genus of gram-negative bacteria comprising elongated forms having tufts of flagella at both poles and usually living in stagnant water rich in organic matter—see rat-bite fever b
pluralspi·ril·la\-ˈril-ə\: any bacterium of the genus Spirillum
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 (seespirochete). Spirilla are gram-negative (seegram stain) and move by means of tufts of flagella at each end.