American Dictionary of the English Language

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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.