sigmoid

English

WOTD – 19 May 2007

Etymology

From (deprecated template usage) [etyl] Ancient Greek σιγμοειδής (sigmoeidḗs), from σίγμα (sígma) or σῖγμα (sîgma, “sigma”) + εἶδος (eîdos, “form, likeness”). Compare with French sigmoïde.

Pronunciation

• IPA^(key): /ˈsɪɡ.mɔɪd/

• Audio (US):

  (file)

Adjective

sigmoid (not comparable)

1. (geometry) Curved in two directions, like the letter "S", or the Greek ς (sigma).
   1. Having a serpentine shape; resembling S or ʃ
   2. (mathematics) Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity
2. (geometry, archaic) Semi-circular, like the lunar sigma (similar to English C).
3. (anatomy) Relating to the sigmoid flexure of the large intestine.

Synonyms

• sigmoidal

Derived terms

Derived terms

• sigmoid artery
• sigmoid colon
• sigmoid flexure
• sigmoid fossa
• sigmoid function

• sigmoid groove
• sigmoidoscope
• sigmoid sinus
• sigmoid valve
• subsigmoid

Translations

in geometry: curved in two directions

• Spanish: sigmoideo
• (deprecated template usage) {{trans-mid}}

in geometry: semi-circular

• (deprecated template usage) {{trans-mid}}

in anatomy: relating to the sigmoid flexure of the large intestine

• Catalan: sigmoïdal (ca)
• (deprecated template usage) {{trans-mid}}
• Spanish: sigmoideo

The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

Translations to be checked

• French: ^{(please verify)} sigmoïde (fr)
• (deprecated template usage) {{trans-mid}}

Noun

sigmoid (plural sigmoids)

1. (mathematics) A function having a graph whose shape is sigmoid. See Wikipedia and Mathworld.

Translations

in mathematics: function having a graph whose shape is sigmoid

• (deprecated template usage) {{trans-mid}}