spirillum
American Heritage Dictionary:
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spi·ril·lum
(spī-rĭl'əm) 
n., pl., -ril·la (-rĭl'ə).
n., pl., -ril·la (-rĭl'ə).
- 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.
[New Latin Spīrillum, genus name, diminutive of Latin spīra, coil. See spire2.]
Britannica Concise Encyclopedia:
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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 ( spirochete). Spirilla are gram-negative ( gram stain) and move by means of tufts of flagella at each end.
For more information on spirillum, visit Britannica.com.
American Heritage Stedman's Medical Dictionary:
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spi·ril·lum
(spī-rĭl'əm)
n., pl. -ril·la (-rĭl'ə).
n., pl. -ril·la (-rĭl'ə).
- A member of the genus Spirillum.
- Any of various other spiral-shaped microorganisms.
Saunders Veterinary Dictionary:
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spirillum
Pl. spirilla [L.]
1. a spiral-shaped bacterium.
2. a member of the genus Spirillum.
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Copyrights:
American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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Britannica Concise Encyclopedia
Britannica Concise Encyclopedia. © 1994-2012 Encyclopædia Britannica, Inc. All rights reserved. Read more
American Heritage Stedman's Medical Dictionary
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company.
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Saunders Veterinary Dictionary
Saunders Comprehensive Veterinary Dictionary 3rd Edition. Copyright © 2007 by D.C. Blood, V.P. Studdert and C.C. Gay, Elsevier. All rights reserved.
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