noun psith·y·rus \ˈsithərəs\

Definition of psithyrus

  1. 1 capitalized :  a genus of large bees resembling bumblebees but lacking the pollen-collecting apparatus and the worker caste and being parasitic in the nests of bumblebees

  2. 2 plural psithyri \-ˌrī\ :  any bee of the genus Psithyrus

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Origin and Etymology of psithyrus

New Latin, from Greek psithykos whispering, twittering

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