< /ˈæl sɪˌdaɪn/. of, pertaining, or belonging to the family Alcidae, comprising the auks, murres, puffins, etc.


  1. a bird of the family Alcidae.


  1. of, relating to, or belonging to the Alcidae, a family of sea birds including the auks, guillemots, puffins, and related forms

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