Noun

(en-noun)

(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.

(anatomy) Any enclosed sexine and nexine layers, widening toward the interior of the grain.

* {{quote-book, 1965, Janet Kircher Warter, Palynology of a Lignite of Lower Eocene (Wilcox) Age from Kemper County citation

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

Noun

(arteries)

An efferent blood vessel from the heart, conveying blood away from the heart regardless of oxygenation status; see pulmonary artery.

* {{quote-magazine, year=2013, month=July-August, author= Stephen P. Lownie], [http://www.americanscientist.org/authors/detail/david-m-pelz David M. Pelz

, magazine=(American Scientist), title= Stents to Prevent Stroke , passage=As we age, the major arteries of our bodies frequently become thickened with plaque, a fatty material with an oatmeal-like consistency that builds up along the inner lining of blood vessels. The reason plaque forms isn’t entirely known, but it seems to be related to high levels of cholesterol inducing an inflammatory response, which can also attract and trap more cellular debris over time.}}

A major transit corridor.