Noun genus psithyrus has 1 sense
  1. Psithyrus, genus Psithyrus - a large bee that resembles the bumblebee but lacks pollen-collecting apparatus and a worker caste
    --1 is a kind of arthropod genus
    --1 is a member of Apidae, family Apidae
    --1 has members: cuckoo-bumblebee
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