clines

/K L AY1 N Z/
noun
  1. 1

    A gradation in a character or phenotype within a species or other group.

  2. 2

    Any graduated continuum.

noun
  1. 1

    (inversive geometry) A generalized circle.

Source: https://en.wiktionary.org/wiki/cline, https://en.wiktionary.org/wiki/clines