babesia

noun

ba·​be·​sia bə-ˈbē-zh(ē-)ə How to pronounce babesia (audio)
plural babesias or babesiae bə-ˈbē-zhē-ˌē How to pronounce babesia (audio)
: any of a genus (Babesia) of sporozoans parasitic in mammalian red blood cells (as in Texas fever) and transmitted by the bite of a tick

Word History

Etymology

New Latin, from Victor Babeş †1926 Romanian bacteriologist

First Known Use

1894, in the meaning defined above

Time Traveler
The first known use of babesia was in 1894

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Cite this Entry

“Babesia.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/babesia. Accessed 6 Jul. 2026.

Medical Definition

babesia

noun
ba·​be·​sia bə-ˈbē-zh(ē-)ə How to pronounce babesia (audio)
1
capitalized : the type genus of the family Babesiidae
2
plural babesias or babesiae -zhē-ˌē How to pronounce babesia (audio) : any of the sporozoans of the genus Babesia or sometimes the family Babesiidae that are parasitic in mammalian red blood cells (as in Texas fever) and are transmitted by the bite of a tick

called also piroplasm

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