spirillum

noun
spi·​ril·​lum | \ spī-ˈri-ləm How to pronounce spirillum (audio) \
plural spirilla\ spī-​ˈri-​lə How to pronounce spirillum (audio) \

Definition of spirillum

: any of a genus (Spirillum) of curved elongated motile bacteria having tufts of flagella at both poles broadly : a spiral filamentous bacterium (such as a spirochete)

First Known Use of spirillum

circa 1875, in the meaning defined above

History and Etymology for spirillum

New Latin, from diminutive of Latin spira coil

Learn More About spirillum

Time Traveler for spirillum

Time Traveler

The first known use of spirillum was circa 1875

See more words from the same year

Dictionary Entries Near spirillum

spirillary

spirillum

spirit

See More Nearby Entries 

Statistics for spirillum

Cite this Entry

“Spirillum.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spirillum. Accessed 27 Nov. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More Definitions for spirillum

spirillum

noun
spi·​ril·​lum | \ spī-ˈril-əm How to pronounce spirillum (audio) \

Medical Definition of spirillum

1 capitalized : a genus of gram-negative bacteria comprising elongated forms having tufts of flagella at both poles and usually living in stagnant water rich in organic matter — see rat-bite fever sense b
2 plural spirilla\ -​ˈril-​ə How to pronounce spirillum (audio) \ : any bacterium of the genus Spirillum

More from Merriam-Webster on spirillum

Britannica.com: Encyclopedia article about spirillum

WORD OF THE DAY

Test Your Vocabulary

Farm Idioms Quiz

  • cow coming home
  • What does 'poke' refer to in the expression 'pig in a poke'?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!