noun, plural spirilla [spahy-ril-uh] . Bacteriology.
any of several spirally twisted, aerobic bacteria of the genus Spirillum, certain species of which are pathogenic for humans. See diag. under bacteria.
any of various similar microorganisms.

1870–75; < Neo-Latin, equivalent to Latin spīr(a) (see spire2) + -illum diminutive suffix

spirillar, adjective
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World English Dictionary
spirillum (spaɪˈrɪləm)
n , pl -la
1.  coccus Compare bacillus any bacterium having a curved or spirally twisted rodlike body
2.  any bacterium of the genus Spirillum, such as S. minus, which causes ratbite fever
[C19: from New Latin, literally: a little coil, from spīra a coil]

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American Heritage
Medical Dictionary

spirillum spi·ril·lum (spī-rĭl'əm)
n. pl. spi·ril·la (-rĭl'ə)

  1. A member of the genus Spirillum.

  2. 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.

The American Heritage® Stedman's Medical Dictionary
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Science Dictionary
spirillum   (spī-rĭl'əm)  Pronunciation Key 
Plural spirilla
Any of various bacteria that are shaped like a spiral, such as the spirochete Treponema pallidum, which causes syphilis.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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