Definition from Wiktionary, the free dictionary
sigmoid (not comparable)
- (geometry) Curved in two directions, like the letter "S", or the Greek ς (sigma).
- (geometry, archaic) Semi-circular, like the lunar sigma (similar to English C).
- (anatomy) Relating to the sigmoid flexure of the large intestine.
in geometry: curved in two directions
in geometry: semi-circular
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sigmoid (plural sigmoids)
in mathematics: function having a graph whose shape is sigmoid