πρηνής G4248
prēnḗs · pray-nace' · Adjective
from πρό; leaning (falling) forward ("prone"), i.e. head foremost:--headlong.
1 Occurrence in the King James Bible
Acts 1:18Now this man purchased a field with the reward of iniquity; and falling headlong, he burst asunder in the midst, and all his bowels gushed out.