Definizione monolingua

atrium

atrium (plural atria or atriums)

1. (architecture) A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.
2. (architecture) A square hall lit by daylight from above, into which rooms open at one or more levels.
3. (anatomy) Any enclosed body cavity or chamber
4. (anatomy) An upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.
5. (anatomy) A microscopic air sac within a pulmonary alveolus.
6. (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.
   • 1965, Janet Kircher Warter, Palynology of a Lignite of Lower Eocene (Wilcox) Age from Kemper County^[1], page 52:

     Nexine 0.5? thick, separating from the sexine about 5? from the pore and forming a deep, well-defined atrium.

Definizione dizionario atrium

atrio

vestìbolo

Altri significati:

In many animals, among which the mammals, heart cavity preceding, in the blood circulation, a more muscular ventricle.

(anatomy) Any enclosed body cavity or chamber

square hall lit from above

(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.

(anatomy) A microscopic air sac within a pulmonary alveolus.

body cavity

(architecture) A central room or space in ancient Roman homes, open to the sky in the middle; a similar space in other buildings.

(anatomy) An upper chamber of the heart that receives blood from the veins and forces it into a ventricle. In higher vertebrates, the right atrium receives blood from the superior vena cava and inferior vena cava, and the left atrium receives blood from the left and right pulmonary veins.

chamber of the heart

central room in Roman homes

(architecture) A square hall lit by daylight from above, into which rooms open at one or more levels.