Source : Webster's Revised Unabridged Dictionary (1913)

Diffusive \Dif*fu"sive\, a. [Cf. F. diffusif.]
   Having the quality of diffusing; capable of spreading every
   way by flowing; spreading widely; widely reaching; copious;
   diffuse. ``A plentiful and diffusive perfume.'' --Hare.

Source : WordNet®

diffusive
     adj : spreading by diffusion [syn: {diffusing(a)}, {dispersive}, {disseminative},
            {disseminating}, {scattering}, {spreading}]