The Collaborative International Dictionary of English v.0.48:

hectogram \hec"to*gram\ (h[e^]k"t[-o]*gr[a^]m), n. [F.
   hectogramme, fr. Gr. 'ekato`n hundred + F. gramme a gram.]
   A measure of mass or weight, containing a hundred grams, or
   about 3.527 ounces avoirdupois. See 3rd gram.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hectogram
    n 1: 100 grams [syn: hectogram, hg]