Definitions for child abuse
Random House Webster's College Dictionary
beating, neglect, or other mistreatment of a child by a parent or guardian.
Origin of child abuse:
the physical or emotional or sexual mistreatment of children
The physical, sexual or emotional mistreatment of a child.
U.S. National Library of Medicine
Abuse of children in a family, institutional, or other setting. (APA, Thesaurus of Psychological Index Terms, 1994)