Meaning

3 senses
  1. A foster child of one's parent.

  2. A child of one's foster parent.

  3. A fellow foster child of one's foster parent, not otherwise related to oneself.

Forms

plural: foster siblings
Singularfoster sibling
Pluralfoster siblings

regular

See also

neighbours in the dictionary
foster sibling — meaning, examples, forms, synonyms | Krumeto