Where does “arco-íris” come from?

arco-íris (Portuguese) comes from Portuguese arco, from Old Portuguese arco, from Latin arcus, from Latin solium, from Proto-Indo-European sodyom, from Proto-Indo-European sḗd- — to sit.

arco-íris (Portuguese): rainbow

Definitions

  1. rainbow

Ancestry of “arco-íris”, step by step

arco-íris traces back through two separate lines of ancestry.

via Portuguese arco

StepLanguageWordMeaning
1Portuguesearcoarc; arc, curve; arch
2Old Portuguesearco—
3Latinarcusarc, arch; bow; rainbow
4Latinsoliumseat, chair; throne, chair of state, official...
5Proto-Indo-Europeansodyom—
6Proto-Indo-Europeansḗd-to sit

via Portuguese Íris

StepLanguageWordMeaning
1PortugueseÍrisIris Greek messenger of the gods
2LatinĪris—
3Ancient GreekἾριςIris
4Ancient GreekἼρις—
Every word from Proto-Indo-European sḗd- →Every word from Proto-Indo-European sodyom →Every word from Latin solium →