Wordnet 3.0
NOUN (1)
1.
used in some classifications to encompass the millipedes (Diplopoda) and centipedes (Chilopoda);
formerly a large taxon including also the Pauropoda and Symphyla;
the term Myriapoda now usually used synonymously with Diplopoda and limited to the millipedes;
WordNet (r) 3.0 (2006):
superclass Myriapoda
n 1: used in some classifications to encompass the millipedes
(Diplopoda) and centipedes (Chilopoda); formerly a large
taxon including also the Pauropoda and Symphyla; the term
Myriapoda now usually used synonymously with Diplopoda and
limited to the millipedes