Source : Webster's Revised Unabridged Dictionary (1913)

Decagram \Dec"a*gram\, Decagramme \Dec"a*gramme\, n. [F.
   d['e]cagramme; Gr. de`ka ten + F. gramme. See {Gram}.]
   A weight of the metric system; ten grams, equal to about
   154.32 grains avoirdupois.