Definitions from Wiktionary (sigmoid)

▸ adjective:  (archaic) Semi-circular, like the uncial or lunate sigma (similar to English C).
▸ adjective:  Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.
▸ adjective:  (mathematics) Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity.
▸ adjective:  (anatomy) Relating to the sigmoid colon.
▸ noun:  (anatomy) Ellipsis of sigmoid colon. [(anatomy) The S-shaped section of the large intestine between the descending colon and the rectum.]
▸ noun:  (mathematics) Ellipsis of sigmoid function. [(mathematical analysis, statistics) Any of various real functions whose graph resembles an elongated letter "S"; specifically, the logistic function y=(eˣ)/(eˣ+1)=1/(1+e⁻ˣ).]
▸ Also see sigmoid


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