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 weight, being a thousand grams, equal to 2.2046 pounds avoirdupois (15,432.34 grains). It is equal to the weight of a cubic decimeter of distilled water at the temperature of maximum density, or 39[deg] Fahrenheit.

Source: Webster's Revised Unabridged Dictionary (1913)