megameter

Me*gam"e*ter, n. Etym: [Mega- + -meter: cf. F. mégamètre.] (Physics) 1. An instrument for determining longitude by observation of the stars. 2. A micrometer. [R.] Knight. Meg"a*me`ter, Meg"a*me`tre, n. Etym: [Mega- + meter, metre, n., 2.] Defn: In the metric system, one million meters, or one thousand kilometers.

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