English
extero-
Extero- comes from Latin exter ‘external’, and goes back to Proto-Indo-European *h₁eǵʰsteros.
- Proto-Indo-Europeanc. 4500–2500 BCE*h₁eǵʰsterosreconstructed
- Proto-Italicc. 1500–700 BCE*eksterosreconstructed
- Latinc. 75 BCE–200 CEexter‘external’
- Englishtodayextero-
attested reconstructed ? uncertain or disputed
Lineage
- Proto-Indo-Europeanc. 4500–2500 BCE*h₁eǵʰsterosreconstructed
- Proto-Italicc. 1500–700 BCE*eksterosreconstructed
- Latinc. 75 BCE–200 CEexter‘external’
- Englishtodayextero-
Formed from exter ‘external’ + -o-
The story
Possibly first used in exteroception, coined by Charles Sherrington.
Linked words
through Proto-Italic *eksteros
through Latin exter ‘external’
Today it means
prefix Refers to things on or from the outside.
Language periods are conventional ranges, not dates for this word.
Etymograph / Proto-Indo-European *h₁eǵʰsteros / extero-