English
interprotocol
From inter- + protocol.
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
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
adj Between (communications) protocols
Language periods are conventional ranges, not dates for this word.
Etymograph / interprotocol