Etymology
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Milky Way (n.)

"the galaxy as seen in the night sky," late 14c., loan-translation of Latin via lactea; see galaxy. Formerly in Middle English also Milken-Way and Milky Cercle. The ancients speculated on what it was; some guessed it was a vast assemblage of stars (Democrates, Pythagoras, even Ovid); the question was settled when Galileo, using his telescope, reported that the whole of it was resolvable into stars. Old native names for it include Jacob's Ladder, the Way to St. James's, and Watling Street (late 14c.).

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Definitions of Milky Way

Milky Way (n.)
the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night sky;
Synonyms: Milky Way Galaxy / Milky Way System
From wordnet.princeton.edu