Aphedrōn (ἀφεδρών) compounds apo (away from) and hedra (seat), literally "the seat away from" — a latrine or drain. It appears in Matthew 15:17 and Mark 7:19, where Jesus explains that food enters the stomach and passes into the aphedrōn, whereas evil comes from the heart.
Jesus' use of this earthy, bodily word is itself theologically significant. Incarnational theology is not squeamish. He used the most direct language to make His point: ritual purity is not about what enters the body but about what emerges from the heart. Mark's parenthetical comment (Mark 7:19) — "In saying this, Jesus declared all foods clean" — indicates this is one of the most consequential NT statements for the Jew-Gentile question (cf. Acts 10:15; Galatians 2). External religious performance cannot cleanse what only God can transform from within.