This noun refers to a wave or surge of water, often in the context of rough seas or storms. Luke 8:24 uses it to describe the raging waves (κλύδωνι) of the storm on the Sea of Galilee that threatened the disciples' boat—waves that Jesus then rebuked and stilled. James 1:6 uses it metaphorically: the doubter is like a wave of the sea (κλύδωνι θαλάσσης) driven and tossed by the wind, illustrating spiritual instability. Classical usage extended to medical contexts (fluid movements in the body) and metaphorical seas of troubles, but the NT uses center on literal or symbolic water surges representing chaos and instability.