Kuleyliyaha raadku waa ku-dul-qaadka qiyaasta korantada ee kuleylka dusha sare ee tuubooyinka, taangiyada, valves ama qalabka si loo ilaaliyo heerkulkeeda (iyadoo lagu beddelayo kulaylka ka lumay dahaarka, sidoo kale loo yaqaan ilaalinta dhaxan) ama si loo saameeyo kororka heerkulkeeda .