FOSTER

noun

1. A foster parent.
2. The care given to another; guardianship.

verb

1. To nurture or bring up offspring, or to provide similar parental care to an unrelated child.
2. To cultivate and grow something.
3. To nurse or cherish something.

adjective

1. Providing parental care to children not related to oneself.
2. Receiving such care.
3. Related by such care.