plural noun
In·​ses·​so·​res | \ ˌinˌseˈsōr(ˌ)ēz\

Definition of Insessores

in former classifications
: an order of birds that have the feet adapted for perching including the Passeres and many others

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History and Etymology for Insessores

New Latin, from Late Latin, plural of insessor waylayer (literally, one that sits on), from Latin insessus (past participle) + -or

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of or relating to the heavens

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