Megameter
Megameter , noun
[Mega- + -meter: compare French mégamètre.]
1.
(Physics) An instrument for determining longitude by observation of the stars.
2.
A micrometer. [Rare & Obsolete] — Knight
Megameter , noun
[Mega- + meter, metre, n., 2.]
In the metric system, one million meters, or one thousand kilometers.
Also: Megametre