Pronunciation: (mar'u-nur), [key]
1. a person who directs or assists in the navigation of a ship; sailor.
2. (cap.) Aerospace.one of a series of U.S. space probes that obtained scientific information while flying by or orbiting around the planets Mars, Mercury, and Venus.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.