1
[N-COUNT 可数名词](战争、意外中的)伤亡人员 A
casualty is a person who is injured or killed in a war or in an accident.
2
[N-COUNT 可数名词]受害者;受害方 A
casualty of a particular event or situation is a person or a thing that has suffered badly as a result of that event or situation.
3
[N-UNCOUNT 不可数名词]急诊室;急救室 Casualty is the part of a hospital where people who have severe injuries or sudden illnesses are taken for emergency treatment.
in AM, use 美国英语用 emergency room