Etymograph

English

subprotocol

From sub- + protocol.

Formed from sub- + protocol

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

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Byzantine Greek πρωτόκολλον ‘first sheet glued onto a manuscript’

Late Latin protocollum ‘the first sheet of a volume’

Middle French protocolle ‘document, record’

English protocol

Today it means

noun A secondary or subsidiary protocol.

Sources

Sources: Wiktionary, “subprotocol”. 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 / subprotocol

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