incubated

verb
  1. 1

    To brood, raise, or maintain eggs, organisms, or living tissue through the provision of ideal environmental conditions.

  2. 2

    To incubate metaphorically; to ponder an idea slowly and deliberately as if in preparation for hatching it.

Source: https://en.wiktionary.org/wiki/incubate, https://en.wiktionary.org/wiki/incubated