Where does “planetarian” come from?

planetarian (English) comes from English planetary, from English planet, from Middle English planete, from Old French planete, from Latin planēta, from Ancient Greek πλανήτης, from Ancient Greek -τής, from Ancient Greek πεῖρα — passed , crossed.

planetarian (English): astrologer; An inhabitant of a planet; An...

Definitions

  1. astrologer; An inhabitant of a planet; An...

Ancestry of “planetarian”, step by step

planetarian traces back through two separate lines of ancestry.

via English planetary

StepLanguageWordMeaning
1EnglishplanetaryOf, or relating to planets, or the orbital motion...
2EnglishplanetEach of the seven major bodies which move...
3Middle EnglishplaneteEach of the seven celestial bodies which move...
4Old Frenchplaneteplanet
5Latinplanētaplanet (wandering star)
6Ancient Greekπλανήτηςwanderer, vagabond; planet; a fever that comes in...
7Ancient Greek-τήςAppended to verbs to form agent nouns
8Ancient Greekπεῖραtrial, experiment, attempt
9Proto-Indo-Europeanper-before, in front; first; to go through
10Proto-Indo-Europeanpr̥tóspassed , crossed

via English ān

StepLanguageWordMeaning
1Englishān
2Middle Englishāna, an indefinite article
3Old Englishānlonely; entirely alone, solitary, single; one
4Proto-West Germanicainone
5Proto-Germanicainazone; some
6Proto-Indo-Europeanóynosone; single
Every word from Proto-Indo-European pr̥tósEvery word from Proto-Indo-European per-Every word from Ancient Greek -τής
planetarian — Etymology, Origin & Word History | Etymology Explorer