FOS'TER, verb transitive
1. To feed; to nourish; to support; to being up.
Some say that ravens foster forlorn children.
2. To cherish; to forward; to promote growth. The genial warmth of spring fosters the plants.
3. To cherish; to encourage; to sustain and promote; as, to foster passion or genius.
FOS'TER, verb intransitive To be nourished or trained up together.