1. （用于镇痛或安眠的）鸦片制剂
An opiate is a drug that contains opium. Opiates are used to reduce pain or to help people to sleep.

2. （使人忽视重要事情的）麻醉品，慰藉物
If you call something an opiate, you disapprove of it because it makes people think less or spend less time on important activities.

1. a narcotic drug that contains opium or an opium derivative