The Vietnamese word "thuốc phiện" translates to "opium" in English. It is a noun that refers to a drug derived from the poppy plant, specifically from the sap of the unripe seed pods. Opium has a long history of use for its pain-relieving properties, but it is also known for its addictive qualities and potential for abuse.
"Thuốc phiện" is a specific term for opium, emphasizing its role as a drug with both medicinal and addictive properties.