English

extrabranchial

From extra- + branchial.

Proto-Indo-European *h₁éǵʰs ‘out’

Proto-Indo-European *h₁eǵʰsteros

Proto-Italic *eksteros

Latin exter ‘being on the outside’

Latin extrā ‘outside, except, beyond’

Latin branchiae

New Latin branchialis ‘branchiate’

Today it means

adj Outside of the branchial arches.

Language periods are conventional ranges, not dates for this word.

Etymograph / extrabranchial