The Collaborative International Dictionary
Spirobacteria
Spirobacteria \Spi`ro*bac*te"ri*a\, n. pl.; sing. Spirobacterium. [NL. See 4th Spire, and Bacterium.] (Biol.) See the Note under Microbacteria.
Spirobacteria
Spirillum \Spi*ril"lum\, n. [NL., dim. of L. spira a coil.] (Biol.) A genus of common motile micro["o]rganisms ( Spirobacteria) having the form of spiral-shaped filaments. One species is said to be the cause of relapsing fever.
Wiktionary
spirobacteria
n. (plural of spirobacterium English)