citrulline
noun
cit·rul·line
ˈsi-trə-ˌlēn 
: a crystalline amino acid C6H13N3O3 formed especially as an intermediate in the conversion of ornithine to arginine
Examples of citrulline in a Sentence
Recent Examples on the Web
Studies have not determined if one type of citrulline is better.2
When buying a supplement, make sure the product is independently tested.
—
Kirstyn Hill, Pharmd, Mph, Health, 19 Mar. 2025
Relieves Sore Muscles from Exercise Watermelon contains an amino acid called citrulline, which increases blood concentrations of L-arginine (an amino acid that helps the body build protein).
—Lindsey Desoto, Rd, Ld, Verywell Health, 29 Jan. 2025
Relieves Muscle Soreness The citrulline in watermelon can boost nitric oxide production and reduce ammonia levels.
—Lindsey Desoto, Rd, Ld, Verywell Health, 23 July 2024
Watermelon: Watermelon has high concentrations of citrulline, an amino acid that may enhance blood flow and lessen the risk of ED.
—Amber Smith, Discover Magazine, 15 Jan. 2023
Each scoop provides the natural benefits of creatine, caffeine, citrulline, beta-alanine, and other must-have ingredients.
—The Salt Lake Tribune, 28 Oct. 2022
The only components in the product are caffeine, beta-alanine, l-citrulline, and l-tyrosine.
—Amber Smith, Discover Magazine, 17 Oct. 2022
However, Red Boost also contains L-citrulline, an amino acid linked to vasodilation and blood flow.
—Jon Goodwin, Discover Magazine, 30 Dec. 2022
This supplement is made with a unique 2-in-1 formula that includes L-citrulline and longjack 100 to boost testosterone production while supporting balanced levels.
—The Salt Lake Tribune, 8 Nov. 2022
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Kirstyn Hill, Pharmd, Mph, Health, 19 Mar. 2025
Relieves Sore Muscles from Exercise Watermelon contains an amino acid called citrulline, which increases blood concentrations of L-arginine (an amino acid that helps the body build protein).
—Lindsey Desoto, Rd, Ld, Verywell Health, 29 Jan. 2025
Relieves Muscle Soreness The citrulline in watermelon can boost nitric oxide production and reduce ammonia levels.
—Lindsey Desoto, Rd, Ld, Verywell Health, 23 July 2024
Watermelon: Watermelon has high concentrations of citrulline, an amino acid that may enhance blood flow and lessen the risk of ED.
—Amber Smith, Discover Magazine, 15 Jan. 2023
Each scoop provides the natural benefits of creatine, caffeine, citrulline, beta-alanine, and other must-have ingredients.
—The Salt Lake Tribune, 28 Oct. 2022
The only components in the product are caffeine, beta-alanine, l-citrulline, and l-tyrosine.
—Amber Smith, Discover Magazine, 17 Oct. 2022
However, Red Boost also contains L-citrulline, an amino acid linked to vasodilation and blood flow.
—Jon Goodwin, Discover Magazine, 30 Dec. 2022
This supplement is made with a unique 2-in-1 formula that includes L-citrulline and longjack 100 to boost testosterone production while supporting balanced levels.
—The Salt Lake Tribune, 8 Nov. 2022
Cite this Entry
“Citrulline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/citrulline. Accessed 29 May. 2025.
Copy CitationMedical Definition
citrulline
noun
cit·rul·line
ˈsi-trə-ˌlēn; si-ˈtrəl-ˌēn, -ən
: a crystalline amino acid C6H13N3O3 formed especially as an intermediate in the conversion of ornithine to arginine in the living system
Love words? Need even more definitions?
Merriam-Webster unabridged
Share