Where does “extratropics” come from?

extratropics (English) comes from English extra-, from Latin extrā, from Latin exter, from Proto-Italic *eksteros.

extratropics (English): The middle latitudes beyond the tropics

Definitions

  1. The middle latitudes beyond the tropics

Ancestry of “extratropics”, step by step

StepLanguageWordMeaning
1Englishextra-Outside of, beyond
2Latinextrāon the outside
3LatinexterOn the outside, outward, external, outer; Of...
4Proto-Italic*eksteros—
Every word from Proto-Italic *eksteros →Every word from Latin exter →Every word from Latin extrā →