Military .

a member of the armed forces lost to service through death, wounds, sickness, capture, or because his or her whereabouts or condition cannot be determined.

casualties, loss in numerical strength through any cause, as death, wounds, sickness, capture, or desertion.

one who is injured or killed in an accident

There were no casualties in the traffic accident.

any person, group, thing, etc., that is harmed or destroyed as a result of some act or event

Their house was a casualty of the fire.

a serious accident, esp. one involving bodily injury or death.

noun

blow , calamity , catastrophe , chance , contingency , debacle , disaster , misadventure , misfortune , mishap , dead , death toll , fatality , injured , killed , loss , missing , prey , sufferer , wounded , contretemps , mischance , death , accident , fortuity , hazard , injury , victim