The Collaborative International Dictionary of English v.0.48:
Diplopoda \Di*plop"o*da\, n. pl. [Gr. ? double + -poda.] (Zool.) An order of myriapods having two pairs of legs on each segment; the Chilognatha. [1913 Webster]WordNet (r) 3.0 (2006):
Diplopoda n 1: arthropods having the body composed of numerous double somites each with two pairs of legs: millipedes [syn: Diplopoda, class Diplopoda, Myriapoda, class Myriapoda]