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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While these intensive ingredients get to work, lactobacillus ferment, a probiotic, soothes skin to offset any sensitivity.
—
Jennifer Hussein, Allure, 25 Feb. 2025
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
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Jennifer Hussein, Allure, 25 Feb. 2025
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
See All Example Sentences for lactobacillus
Cite this Entry
“Lactobacillus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lactobacillus. Accessed 7 Jun. 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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