The adjective δίστομος (literally 'two-mouthed,' from δίς + στόμα) describes weapons sharpened on both edges. In biblical usage it appears exclusively in metaphorical contexts about God's word as a weapon: sharper than any two-edged sword in Hebrews 4:12, proceeding from Christ's mouth in Revelation 1:16 and 2:12. The image emphasizes penetrating, discriminating power—a blade that cuts from either direction, leaving nothing unexamined.