The Collaborative International Dictionary of English v.0.48:
maltreatment \mal*treat"ment\, n.; [Cf. F. maltraitement.] Cruel or inhumane treatment; ill usage; abuse. Syn: ill-treatment. [1913 Webster]WordNet (r) 3.0 (2006):
maltreatment n 1: cruel or inhumane treatment; "the child showed signs of physical abuse" [syn: maltreatment, ill-treatment, ill-usage, abuse]