fem abl sg of ku (noun)
Analysis. ku (earth, ground) + to (ablative ending -to); used interrogatively and rhetorically to express difficulty or impossibility — 'from earth?' standing for 'how could this be?'
Etymology. ku (fem noun for earth, ground) is cognate with Latin cis- (on this side), Sanskrit ku- appearing in compounds with spatial sense. The ablative ending -to ('from') turns the concrete noun into an interrogative particle probing spatial/causal origin, extended to manner and rhetorical rejection.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
Lite mode — plain HTML for e-readers and old browsers. Full version