The Collaborative International Dictionary of English v.0.48:

Lactean \Lac"te*an\, a. [See Lacteal.]
   1. Milky; consisting of, or resembling, milk. "This lactean
      whiteness." --Moxon.
      [1913 Webster]

   2. (Anat. & Physiol.) Lacteal; conveying chyle.
      [1913 Webster]