par?a-di?chlo?ro?ben?zene (?pær ? da??kl?r ??b?n zin, -b?n?zin, -?klo?r-) n. a white, crystalline, volatile solid, C6H4Cl2, of the benzene series: used chiefly as a moth repellent. [1875?80] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.