noun
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.
彼はアルコール依存症者として治療を受けている。
He is receiving treatment as an alcohol addict.
ギャンブル依存症者の家族は大きな負担を感じることが多い。
Families of gambling addicts often feel a heavy burden.
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.