incubate

Short definition from Wiktionary

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.

Noun

1. 1
   A preparation, or material, that has been incubated.