1. Consisting of, or containing, milk. Pails high foaming with a milky flood. (pope)
2. Like, or somewhat like, milk; whitish and turbid; as, the water is milky. Milky juice.
3. Yielding milk. Milky mothers.
4. Mild; tame; spiritless. Has friendship such a faint and milky heart? (Shak) Milky way.
(Science: astronomy) See galaxy.