A library atrium.



  • A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  • A square hall lit by daylight from above, into which rooms open at one or more levels.
  • A cavity, entrance, or passage.
  • Any enclosed sexine and nexine layers, widening toward the interior of the grain.


Similar words


  • From Latin ātrium, from Etruscan.

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