The Collaborative International Dictionary of English v.0.48:

Dyne \Dyne\, n. [Formed fr. Gr. ? power. See Dynamic.]
   (Physics)
   The unit of force, in the C. G. S. (Centimeter Gram Second)
   system of physical units; that is, the force which, acting on
   a gram for a second, generates a velocity of a centimeter per
   second.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dyne
    n 1: a unit of force equal to the force that imparts an
         acceleration of 1 cm/sec/sec to a mass of 1 gram