The Collaborative International Dictionary of English v.0.48:

Ballistite \Bal"lis*tite\, n. [See Ballista.] (Chem.)
   A smokeless powder containing equal parts of soluble
   nitrocellulose and nitroglycerin.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Ballistite
    n 1: an explosive (trade name Ballistite) that burns with
         relatively little smoke; contains pyrocellulose and is used
         as a propellant [syn: smokeless powder, Ballistite]