citrulline
noun
citrulline is spelled C-I-T-R-U-L-L-I-N-E. The wrong spelling people search most is citruline: about 280 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 10 of all searches for the word. Citrulline is a noun meaning “An amino acid, first isolated from watermelons, that is an intermediate in the urea cycle”. The plural of citrulline is citrullines.
How do you spell citrulline?
Citrulline is spelled C-I-T-R-U-L-L-I-N-E. One wrong spelling is searched or written often enough to measure; together they are about 1 in 10 of the searches for citrulline in either form.
Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026). Wrong spellings are taken from Wiktionary entries tagged "misspelling" and its obsolete or nonstandard forms, Wikipedia's Lists of common misspellings and the codespell dictionary, then measured. The proofreader's marks show the change that corrects each one.
What does citrulline mean?
noun
- 1
An amino acid, first isolated from watermelons, that is an intermediate in the urea cycle.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Forms of citrulline
- citrullines plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How common is citrulline?
Citrulline appears about once in every 16 million words in written English, the 121,279th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Citrulline in Spanish, French, German and Portuguese
In the sense an amino acid:
| Language | Words |
|---|---|
| Spanish | citrulina |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.