theorycraft

The story

1. Proto-Hellenic*tʰā́wā
2. Ancient Greekθέᾱ (théā)
3. Proto-Indo-European*wer-
4. Proto-Indo-European*h₃ekʷ-
5. Proto-Indo-European*weyd-
6. Ancient Greekὁράω (horáō)
7. Ancient Greek*θεᾱ-(ϝ)ορός, *θεη-(ϝ)ορός (*theā-(w)orós, *theē-(w)orós)
8. Ancient Greekθεωρός (theōrós)
9. Ancient Greekθεωρία (theōría)
10. Late Latintheōria
11. Middle Frenchthéorie
12. Englishtheory
13. Proto-Germanic*krafjaną
14. Proto-Germanic*kraftuz
15. Proto-West Germanic*kraftu
16. Old Englishcræft
17. Middle Englishcraft
18. Englishcraft
19. English todaytheorycraft

From theory + craft.