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atrium noun

  /ˈeɪ.tɹi.əm/
  • (architecture) A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
  • (architecture) A square hall lit by daylight from above, into which rooms open at one or more levels.
  • (biology) Any enclosed body cavity or chamber.
 atrio
  • (palynology) A cavity inside a porate aperture of a pollen grain formed by the separation of the sexine and nexine layers, widening toward the interior of the grain.
 aurícula, atrio
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