spirillum spi·ril·lum (spī-rĭl'əm)
n. pl. spi·ril·la (-rĭl'ə)
A member of the genus Spirillum.
Any of various other spiral-shaped microorganisms.
Spirillum n.
A genus of large, aerobic, gram-negative bacteria having an elongated spiral form and a tuft of flagella.