The Collaborative International Dictionary of English v.0.48:

Machilidae \Machilidae\, prop. n.
   A natural family of insects including the jumping
   bristletails.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

Machilidae
    n 1: jumping bristletails [syn: Machilidae, family
         Machilidae]