lactescence

from The Century Dictionary.

• noun The state of being lactescent; milkiness or milky coloration.
• noun In botany, an abundant flow of juice or sap from a plant when wounded, commonly white, but sometimes yellow or red.

from the GNU version of the Collaborative International Dictionary of English.

• noun The state or quality of producing milk, or milklike juice; resemblance to milk; a milky color.
• noun (Bot.) The latex of certain plants. See Latex.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The state or quality of producing milk, or milky sap.
• noun Resemblance to milk; a milky colour.
• noun botany The latex of certain plants.