lactobacillus

noun

lac·​to·​ba·​cil·​lus ˌlak-tō-bə-ˈsi-ləs 

: any of a genus (Lactobacillus) of bacteria that produce lactic acid

Examples of lactobacillus in a Sentence

Recent Examples on the Web

VagiBiOM features LactoBALANCE and hyaluronic acid, along with lactobacillus ferment, lactulose and lactic acid. — Hanna Wickes, Sacbee.com, 14 Oct. 2026

VagiBiOM features hyaluronic acid, lactobacillus ferment and lactic acid. — Hanna Wickes, Fort Worth Star-Telegram, 14 Oct. 2026

Salt & Stone deodorants sometimes use spirulina and lactobacillus ferment for prebiotics and other ingredients. — Alexandra Frost, USA Today, 10 July 2026

And some women can have little to no lactobacillus and be perfectly healthy. — Ej Dickson, Wired News, 12 May 2026

Word History

Etymology

New Latin

First Known Use

1924, in the meaning defined above

Rhymes for lactobacillus

• amaryllis
• haemophilus
• bacillus
• utilise
• hilus
• villous
• villus
• willis

Medical Definition

lactobacillus

noun

lac·​to·​ba·​cil·​lus ˌlak-tō-bə-ˈsil-əs 

1

capitalized : a genus of gram-positive nonmotile lactic-acid-forming bacteria of the family Lactobacillaceae including various commercially important lactic acid bacteria

2

plural lactobacilli

-ˌī also -ˌē

: any bacterium of the genus Lactobacillus