The Collaborative International Dictionary of English v.0.48:

Milkiness \Milk"i*ness\, n.
   State or quality of being milky.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "milkiness":
   achroma, achromasia, achromatosis, albescence, albinism, albino,
   albinoism, blondness, canescence, chalkiness, chylifaction,
   chylification, creaminess, fairness, flow, fluency, fluidity,
   fluidness, flux, fluxility, fluxion, frostiness, glaucescence,
   glaucousness, grizzliness, hoariness, juiciness, lactation,
   lactescence, leukoderma, lightness, liquefaction, liquidness,
   moisture, paleness, pearliness, rheuminess, sappiness, serosity,
   silver, silveriness, snowiness, succulence, suppuration, vitiligo,
   wateriness, white, white race, whiteness, whitishness