(archaic) Semi-circular, like the uncial or lunar sigma (similar to English C). / Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.

(anatomy) Ellipsis of sigmoid colon.. / (mathematics) Ellipsis of sigmoid function..

plural of sigmoid

sigmoid; S-shaped. / (statistics) Characterized by a sigmoid curve or function

A sigmoidal function or curve

(uncountable) The quality of being sigmoid / (countable) A sigmoid shape

plural of sigmoidicity

In a sigmoidal manner.

(pathology) inflammation of the sigmoid colon

The condition of being sigmoidal