declivities

/D IH0 K L IH1 V AH0 T IY0 Z/
noun
  1. 1

    The downward slope of a hill; the downward slope of a curve.

  2. 2

    A downward bend in a path.

  3. 3

    An inward curve of the exoskeleton of an insect, such as between body segments; a segment of an insect's body where the exoskeleton curves inward.

Source: https://en.wiktionary.org/wiki/declivities, https://en.wiktionary.org/wiki/declivity