Me*gam"e*ter (?), n. [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. [Mega- + meter, metre, n.,
2.] In the metric system, one million meters, or one thousand
kilometers.