1. astream - Adjective
2. astream - Adverb
Streaming, flowing (of a liquid, object blown by wind, light, sound).
The biker sped by, hair astream from under her helmet.
Having something flowing from, down or along it; covered (with something flowing).
Past the finish line, she doubled over panting, her hair astream with sweat.
In, into, on, onto or along a stream (or other watercourse).
I prefer to clean the fish I catch right away, while I’m astream.
(nautical) In line with the stream.
Source: en.wiktionary.org