English
interinjection
From inter- + injection.
Formed from inter- + injection
Proto-Indo-European *h₁én ‘in’
Proto-Indo-European *h₁entér ‘between’
Proto-Italic *n̥ter ‘between’
Latin inter ‘between’
English inter-
Proto-Indo-European *(H)yeh₁- ‘to throw’
…
Latin iaciō ‘throw, hurl’
Latin iniciō ‘to throw, cast, hurl or place in, on, into,…’
Latin iniectio
Middle French injection
English injection
Today it means
adj Between successive injections
Language periods are conventional ranges, not dates for this word.
Etymograph / interinjection