Curved; bent; crooked.
bending inwards.
to have a curved or bent shape; to bend or curve inwards.
To bend (especially inwards); to give a curved shape to.
Curved in two directions, like the letter "S", or the Greek ς (sigma); having a serpentine shape.
Relating to the sigmoid colon.
Exhibiting logistic growth; having a graph that accelerates until it reaches a carrying capacity.