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Webster 1913 Edition

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Noun.

[NL., dim. of L.

spira

a coil.]

(Biol.)

A genus of common gram-negative motile microorganisms (family

Spirillaceae

) having the form of spiral-shaped filaments. They are obligately microaerophilic, and do not ferment carbohydrates.

Stedman.

See also: Spirillum

spirillum ‎(plural spirillums or spirilla)

Any of various aerobic bacteria of the genus Spirillum, having an elongated spiral form and bearing a tuft of flagella.
Any of various other spiral-shaped microorganisms.

any of various aerobic bacteria of the genus Spirillum