sigmoid /ˈsɪɡ.mɔɪd/adjective 4noun 2forms 3 adjective4 •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. •Relating to the sigmoid colon. •(no longer used) Semi-circular, like the uncial or lunate sigma (similar to English C). noun2 •Ellipsis of sigmoid function. •Ellipsis of sigmoid colon. formssigmoids · more sigmoid · most sigmoid