sigmoid
/ˈsɪɡ.mɔɪd/adjective, noun
sigmoid is spelled S-I-G-M-O-I-D. The wrong spelling people search most is sygmoid: about 10 Bing searches a month in the United States (September 2025 to August 2026), about 1 in 133 of all searches for the word. Sigmoid is an adjective meaning “Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape”.
How many letters and syllables are in sigmoid?
| Letters | 7: S-I-G-M-O-I-D |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | about once in every 9 million words; the 90,432nd most frequent word form |
| Wrong spellings searched | 1; the most searched, sygmoid, about 10 Bing searches a month (all of them) |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); 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).
How do you spell sigmoid?
Sigmoid is spelled S-I-G-M-O-I-D. One wrong spelling is searched or written often enough to measure; together they are about 1 in 133 of the searches for sigmoid 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.
How common is sigmoid?
Sigmoid appears about once in every 9 million words in written English, the 90,432nd 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).
How do you pronounce sigmoid?
- US /ˈsɪɡ.mɔɪd/
- Australia /ˈsɪɡ.moɪd/
- /ˈsəɡ.moɪd/
Sigmoid has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-sigmoid.ogg, Wikimedia Commons (author and licence on each file's page).
Forms of sigmoid
- more sigmoid comparative
- most sigmoid superlative
- sigmoids plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does sigmoid mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
archaicSemi-circular, like the uncial or lunate sigma (similar to English C).
- 2
Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.
- 3
Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity.
- 4
Relating to the sigmoid colon.
noun
- 1
Ellipsis of sigmoid colon.
- 2
Ellipsis of sigmoid function.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Sigmoid in Spanish, French, German and Portuguese
In the sense S-shaped, sigma-shaped:
| Language | Words |
|---|---|
| Spanish | sigmoideo |
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.
Where does sigmoid come from?
Borrowing from Ancient Greek σῑγμοειδής (sīgmoeidḗs, “of the shape of sigma”), from σῖγμᾰ (sîgmă, “sigma”) + -ο- (-o-) + -ειδής (-eidḗs, “-oid, -like”); Equivalent to sigma + -oid. Compare with French sigmoïde.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).