edaphos denotes the surface onto which Saul fell when he heard the voice.

The attested use denotes the surface reached when Saul fell, in the setting of hearing a voice.

1. The surface onto which someone falls · dominant

   In Acts 22:7, the accusative singular neuter form occurs with Saul's falling; the APB renders the clause, "I fell to the ground and heard a voice."

   Acts 22:7

In the Anselm Project Bible: In Acts 22:7, the APB presents the scene as "I fell to the ground." This confirms the clause's setting rather than isolating a precise English equivalent.