Sigmoid

Pronunciation

• IPA: /ˈsɪɡ.mɔɪd/

Origin

From Ancient Greek σιγμοειδής, from σίγμα or σῖγμα (sîgma, "sigma") + εἶδος (eîdos, "form, likeness"). Compare with French sigmoïde.

Full definition of sigmoid

Adjective

1. (geometry) Curved in two directions, like the letter "S", or the Greek Ï‚ (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

• sigmoid artery
• sigmoid colon
• sigmoid flexure
• sigmoid fossa
• sigmoid groove
• sigmoid sinus
• sigmoid valve
• sigmoid function
• sigmoidoscope

Noun

1. (mathematics) A function having a graph whose shape is sigmoid. See Sigmoid and Mathworldhttp://mathworld.wolfram.com/SigmoidFunction.html.