Etymograph

English

substream

From sub- + stream.

A compound of sub- + stream

Proto-Indo-European *upó ‘up; from below’

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Proto-Indo-European *srew- ‘to flow’

…

Proto-Germanic *straumaz

Proto-West Germanic *straum

Old English strēam

Middle English streem

English stream

Today it means

noun A stream contained within another stream.

Sources

Sources: Wiktionary, “substream”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / substream

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