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Noun rickettsiales has 1 sense
  1. Rickettsiales, order Rickettsiales - pleomorphic gram-negative microorganisms
    --1 is a kind of animal order
    --1 is a member of division Eubacteria
    --1 has members:
     Rickettsiaceae, family Rickettsiaceae; Chlamydiaceae, family Chlamydiaceae
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