Adjective achromatic has 3 senses
  1. white, achromatic - being of the achromatic color of maximum lightness; having little or no hue owing to reflection of almost all incident light; "as white as fresh snow"; "a bride's white dress"
  2. black, achromatic - being of the achromatic color of maximum darkness; having little or no hue owing to absorption of almost all incident light; "black leather jackets"; "as black as coal"; "rich black soil"
  3. achromatic - having no hue
    chromatic, amber, brownish-yellow, yellow-brown, amethyst, aureate, gilded, gilt, gold, golden, azure, cerulean, sky-blue, bright blue, blue, bluish, blueish, light-blue, dark-blue, blue-black, bluish green, blue-green, cyan, teal, blushful, rosy, bottle-green, bronze, bronzy, brown, brownish, dark-brown, buff, canary, canary-yellow, caramel, caramel brown, carnation, chartreuse, dun, earthlike, fuscous, taupe, green, greenish, light-green, dark-green, jade, jade-green, khaki, lavender, lilac, mauve, moss green, mosstone, mousy, mouse-colored, mouselike, ocher, ochre, olive-brown, olive-drab, olive, orange, orangish, peacock-blue, pink, pinkish, purple, violet, purplish, red, reddish, ruddy, blood-red, carmine, cerise, cherry, cherry-red, crimson, ruby, ruby-red, scarlet, rose, roseate, rosaceous, rose-red, rust, rusty, sapphire, snuff, snuff-brown, mummy-brown, chukker-brown, sorrel, brownish-orange, stone, straw, tan, tannish, tangerine, tawny, ultramarine, umber, vermilion, vermillion, cinnabar, Chinese-red, vinaceous, yellow, yellowish, xanthous, yellow-green, auburn, reddish-brown, avocado, beige, blae, chestnut, coppery, copper colored, coral, creamy, cress green, cresson, watercress, hazel, honey, magenta, maroon, brownish-red, pea-green, powder blue, russet, sage, sage-green, sea-green