Where does “antiboreal” come from?

antiboreal (English) comes from English anti, from English anti-, from Ancient Greek ἀντι-, from Ancient Greek ᾰ̓ντῐ́ — opposite.

Ancestry of “antiboreal”, step by step

antiboreal traces back through two separate lines of ancestry.

via English anti

StepLanguageWordMeaning
1EnglishantiOpposed to something; That has a torsion angle...
2Englishanti-Against, hostile to; Contrasting with the norm;...
3Ancient Greekἀντι-anti-, against; like, reminiscent of
4Ancient Greekᾰ̓ντῐ́opposite

via English boreal

StepLanguageWordMeaning
1EnglishborealOf, relating to, or coming from the north
2Latinboreālisnorthern
3Latin-ālis
4Proto-Italic-ālisforms relational adjectives
Every word from Ancient Greek ᾰ̓ντῐ́Every word from English anti-Every word from English anti