addict; dependent person
Refers to a person who is addicted to or dependent on a substance or behavior. Often used in medical or social contexts.
He is receiving treatment as an alcohol addict.
Families of gambling addicts often feel a heavy burden.
依存症 is the condition of addiction itself, while 依存症者 refers to the person suffering from it.
中毒者 often implies poisoning or acute intoxication, whereas 依存症者 focuses on psychological or physical dependence.
Compound of 依存症 (addiction) + 者 (person). The exact historical derivation is uncertain, but the word follows a common pattern for naming a person with a condition.