Where does “thunderegg” come from?

thunderegg (English) comes from English egg, from Middle English eggen, from Old Saxon eggian, from Old Norse eggja, from Old Norse egg, from Proto-Germanic agjō, from Proto-Indo-European h₂eḱ- — sharp.

thunderegg (English): A roughly spherical, nodule-like geological...

Definitions

  1. A roughly spherical, nodule-like geological...

Ancestry of “thunderegg”, step by step

thunderegg traces back through two separate lines of ancestry.

via English egg

StepLanguageWordMeaning
1EnglisheggAn approximately spherical or ellipsoidal body...
2Middle EnglisheggenTo egg on; to encourage or provide motivation; To...
3Old Saxoneggianto harrow
4Old Norseeggjato incite, egg on to do
5Old Norseeggegg; edge
6Proto-Germanicagjōedge, corner
7Proto-Indo-Europeanh₂eḱ-sharp

via English thunder

StepLanguageWordMeaning
1EnglishthunderThe loud rumbling, cracking, or crashing sound...
2Middle EnglishthunderAlternative form of thonder
3Old EnglishÞunorthe Anglo-Saxon god of thunder, equivalent to Old Norse Þórr and Old High German Donar
4Proto-West Germanicþunrthunder
5Proto-GermanicÞunrazThor, god of thunder
6Proto-Indo-European(s)ten-to thunder, rustle, rumble, drone, groan; to...
Every word from Proto-Indo-European h₂eḱ-Every word from Proto-Germanic agjōEvery word from Old Norse egg
thunderegg — Etymology, Origin & Word History | Etymology Explorer