IPA: /ˈstriːmər/
KK: /ˈstrimər/
A person who broadcasts live video content over the internet, often while playing video games or engaging with an audience.
The streamer entertained thousands of viewers while playing the latest video game.
Streamer → It is formed from "stream" (from Old English *stream*, meaning a flow of water or a current) and "-er" (meaning a person who). A streamer is a person who streams, or broadcasts, content over the internet, often in a flowing manner like a stream.
Think of someone who is 'flowing' content like a 'stream' — that's why a streamer is a person who shares live video or audio.