Where does “antisun” come from?

antisun (English) comes from English Sun, from Middle English sunne, from Old English sunne, from Proto-West Germanic sunnā, from Proto-Germanic sunnǭ, from Proto-Indo-European sh̥₂uén, from Proto-Indo-European sóh₂wl̥ — sun.

antisun (English): A hypothetical sun composed of antimatter;...

Definitions

  1. A hypothetical sun composed of antimatter;...

Ancestry of “antisun”, step by step

antisun traces back through two separate lines of ancestry.

via English Sun

StepLanguageWordMeaning
1EnglishSunAbbreviation of Sunday
2Middle EnglishsunneAlternative form of sonne; sun
3Old Englishsunnesun
4Proto-West Germanicsunnāsun
5Proto-Germanicsunnǭthe sun
6Proto-Indo-Europeansh̥₂uénsun; the Sun
7Proto-Indo-Europeansóh₂wl̥sun

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
Every word from Proto-Indo-European sóh₂wl̥ →Every word from Proto-Indo-European sh̥₂uén →Every word from Proto-Germanic sunnǭ →
antisun — Etymology, Origin & Word History | Etymology Explorer