From the base of koniao and ornumi (to "rouse"); pulverulence (as blown about) -- dust.
see GREEK koniao
1. properly, raised dust, flying dust (Herodotus, Plato, Polybius, others).
2. universally, dust: Matthew 10:14; Luke 9:5; Luke 10:11; Acts 13:51; Acts 22:23. (For אָבָק, Exodus 9:9; Nahum 1:3; for עָפָר, Deuteronomy 9:21.)