rainbowbetical order Share definition Flag arrangement of objects in order of the colors of the rainbow. i arranged the clothes in my closet in rainbowbetical order!! red, orange, yellow, green, blue, purple. rainbowbetical order by EunicenAgnes June 23, 2008 0 0 Get merch Get the rainbowbetical order mug. Buy Now — $32.95 See more merch