Source : Webster's Revised Unabridged Dictionary (1913)

Particulate \Par*tic"u*late\, v. t. & i. [See {Particle}.]
   To particularize. [Obs.]

Particulate \Par*tic"u*late\, a.
   1. Having the form of a particle.

   2. Referring to, or produced by, particles, such as dust,
      minute germs, etc. [R.]

            The smallpox is a particulate disease. --Tyndall.

Source : WordNet®

particulate
     n : a small discrete mass of solid or liquid matter that remains
         individually dispersed in gas or liquid emissions
         (usually considered to be an atmospheric pollutant) [syn:
          {particulate matter}]

particulate
     adj : composed of distinct particles [ant: {nonparticulate}]