Pronunciation: (pur-tik'yu-lit, -lāt", pu-tik'-, pär-), [key]
of, pertaining to, or composed of distinct particles.
1. a separate and distinct particle.
2. a material composed of such particles.
a. the aggregate of such particles, esp. as produced by one source: tests to analyze diesel particulates.
b. Meteorol.solid or liquid particles suspended in the atmosphere, esp. pollutants.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.