English

extrastimulus

From extra- + stimulus.

Proto-Indo-European *h₁éǵʰs ‘out’

Proto-Indo-European *h₁eǵʰsteros

Proto-Italic *eksteros

Latin exter ‘being on the outside’

Latin extrā ‘outside, except, beyond’

Latin stimulus ‘goad, prick’

Today it means

noun A premature stimulus delivered during an extrasystole in order to terminate it

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

Etymograph / extrastimulus