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
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The elixir pairs ingredients like vitamin E, niacinamide, lactobacillus extract complex, and even SPF 17 to protect against UV rays and improve skin tone, texture, and moisture levels.
—
Kiana Murden, Vogue, 31 Jan. 2025
Case in point: Our favorite base makeup is formulated with skin-loving, acne-fighting ingredients like salicylic acid, hyaluronic acid, anti-inflammatory ingredients (like lactobacillus ferment), and beyond.
—Annie Blackman, Allure, 7 Sep. 2024
Plus, skin-care mainstay Centella Asiatica (also known as cica) soothes and calms the scalp, while lactobacillus ferment, a probiotic, balances the microbiome to prevent inflammation.
—Jenny Berg, Allure, 1 Nov. 2024
In healthy women without bacterial vaginosis, lactobacillus crispatus is the dominant bacteria and in those in a dysbiotic state there’s less lactobacillus crispatus and a more diverse microbiota, including bacteria like gardnerella vaginalis.
—Sara Novak, Discover Magazine, 12 June 2024
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Kiana Murden, Vogue, 31 Jan. 2025
Case in point: Our favorite base makeup is formulated with skin-loving, acne-fighting ingredients like salicylic acid, hyaluronic acid, anti-inflammatory ingredients (like lactobacillus ferment), and beyond.
—Annie Blackman, Allure, 7 Sep. 2024
Plus, skin-care mainstay Centella Asiatica (also known as cica) soothes and calms the scalp, while lactobacillus ferment, a probiotic, balances the microbiome to prevent inflammation.
—Jenny Berg, Allure, 1 Nov. 2024
In healthy women without bacterial vaginosis, lactobacillus crispatus is the dominant bacteria and in those in a dysbiotic state there’s less lactobacillus crispatus and a more diverse microbiota, including bacteria like gardnerella vaginalis.
—Sara Novak, Discover Magazine, 12 June 2024
See All Example Sentences for lactobacillus
Cite this Entry
“Lactobacillus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lactobacillus. Accessed 3 Mar. 2025.
Copy CitationMedical 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
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