From The Collaborative International Dictionary of English v.0.48:

Kilogram \Kil"o*gram\, Kilogramme \Kil"o*gramme\, n. [F.
   kilogramme; pref. kilo- (fr. Gr. chi`lioi a thousand ) +
   gramme. See 3d Gram.]
   A measure of mass and weight, being a thousand grams, equal
   to 2.2046226 pounds avoirdupois (15,432.34 grains). It is
   nearly equal to the mass of a cubic decimeter of distilled
   water at the temperature of maximum density, or 39[deg]
   Fahrenheit. See 3rd gram.
   [Webster 1913 Suppl.] Kilogrammeter
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