Where does “astro-” come from?

astro- (English) comes from Ancient Greek ἄστρον, from Ancient Greek ἀστήρ, from Proto-Hellenic astḗr, from Proto-Indo-European h₂stḗr, from Proto-Indo-European h₂eHs- — to be/become dry; to burn, to glow; hearth.

astro- (English): celestial bodies: fixed stars, wandering stars (planets), etc.; space; astronomy

Definitions

  1. celestial bodies: fixed stars, wandering stars (planets), etc.; space; astronomy

Ancestry of “astro-”, step by step

StepLanguageWordMeaning
1Ancient GreekἄστρονA celestial body
2Ancient Greekἀστήρa celestial body; illustrious person; starfish
3Proto-Hellenicastḗrstar
4Proto-Indo-Europeanh₂stḗrstar
5Proto-Indo-Europeanh₂eHs-to be/become dry; to burn, to glow; hearth

Words derived from “astro-

Every word from Proto-Indo-European h₂eHs-