sigmoid

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sigmoid

/ˈsɪɡ.mɔɪd/ Canada, US, UK
/ˈsɪɡ.moɪd/ Australia
/ˈsəɡ.moɪd/ New Zealand

Rhymes with -ɪɡmɔɪd

Where it comes 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.

adjective more sigmoid · most sigmoid

archaic Semi-circular, like the uncial or lunate sigma (similar to English C).
Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.
Similar: S-shaped
Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity.
Similar: S-shaped
Relating to the sigmoid colon.
Similar: sigmoidal

noun sigmoids

abbreviation, ellipsis Ellipsis of sigmoid colon
abbreviation, ellipsis Ellipsis of sigmoid function If we had the textbook from a hundred years in the future that contains all the simple ideas that actually work, that take so long to identify in practice — the ReLUs instead of sigmoids — for those of us who’ve been following AI for, like, more than the last couple of years and know what I’m taking

Translations

Every language

adj S-shaped, sigma-shaped

Español	sigmoideo
中文	乙狀 /乙状 yǐzhuàng

adj relating to the sigmoid colon

Español	sigmoideo
中文	乙狀結腸的 /乙状结肠的 yǐzhuàngjiécháng de

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MLA

"sigmoid." Wiktionary, via Micwyn, micwyn.com/word/sigmoid. Accessed 6 Nov. 2026.

APA

sigmoid. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/sigmoid

Chicago

"sigmoid." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/sigmoid.

BibTeX

@misc{sigmoid_2026,
  title = {sigmoid},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/sigmoid},
  urldate = {2026-11-06}
}