Metra

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A metra was a unit of length. Its equivalent Earth measure was unknown, but it was longer than a kilometer.

A metra was subdivided into a number of motras, with 600 motras being described as "just over half a metra." ("What Was Lost - Resurrection")

When John Crichton suggested that they destroy a command carrier, Rygel stated that the carrier was over a metra long. ("Into the Lion's Den - Wolf in Sheep's Clothing")