intercrossing

/IH0 N T ER0 K R AO1 S IH0 NG/
verb
  1. 1

    To cross back over one another

  2. 2

    To breed two strains having a common ancestry with one another

noun
  1. 1

    The interbreeding of two strains that have a common ancestry

Source: https://en.wiktionary.org/wiki/intercross, https://en.wiktionary.org/wiki/intercrossing