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ENGLISH · A WORD WITH POSSIBILITIES

sigmoid.

Semi-circular, like the uncial or lunate sigma (similar to English C).

7 characters2 syllables approx.English language

Meaning & usage

adj/ˈsɪɡ.mɔɪd/Canada, General-American, Received-Pronunciation/ˈsɪɡ.moɪd/Australia/ˈsəɡ.moɪd/New-Zealand

  1. Semi-circular, like the uncial or lunate sigma (similar to English C).

    archaic

  2. Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.

  3. Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape. Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity.

  4. Relating to the sigmoid colon.

Where this word comes from

Etymology tree Ancient Greek σῖγμᾰ (sîgmă) Ancient Greek -ο- (-o-) Proto-Indo-European *weyd- Proto-Indo-European *-os Proto-Indo-European *wéydos Proto-Hellenic *wéidos Ancient Greek εἶδος (eîdos) Proto-Indo-European *-os Proto-Indo-European *-ēs Proto-Hellenic *-ēs Ancient Greek -ης (-ēs) Ancient Greek -ειδής (-eidḗs) Ancient Greek σῑγμοειδής (sīgmoeidḗs)bor. English sigmoid 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.

noun/ˈsɪɡ.mɔɪd/Canada, General-American, Received-Pronunciation/ˈsɪɡ.moɪd/Australia/ˈsəɡ.moɪd/New-Zealand

  1. Ellipsis of sigmoid colon.

    abbreviation · alt-of · ellipsis

  2. Ellipsis of sigmoid function.

    abbreviation · alt-of · ellipsis
Where this word comes from

Etymology tree Ancient Greek σῖγμᾰ (sîgmă) Ancient Greek -ο- (-o-) Proto-Indo-European *weyd- Proto-Indo-European *-os Proto-Indo-European *wéydos Proto-Hellenic *wéidos Ancient Greek εἶδος (eîdos) Proto-Indo-European *-os Proto-Indo-European *-ēs Proto-Hellenic *-ēs Ancient Greek -ης (-ēs) Ancient Greek -ειδής (-eidḗs) Ancient Greek σῑγμοειδής (sīgmoeidḗs)bor. English sigmoid 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.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.