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A room in the middle of a house or courtyard leading to house which has open ceiling, sometimes a water feature and ART displayed as in a gallery. Similar to an "atrium" but with ARTWORK as the main attraction.
Jimmer emptied the espresso maker into his cup and took a leisurely amble into the artrium where he contemplated sculptures, paintings and prints waiting for him there.
artrium by jim christ August 14, 2009
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Mingling in the atrium 

An innuendo used at the end of a speech to imply you like fingering buttholes.
Ben: "...so if you have any other questions come find me after this presentation. I will be mingling in the atrium".

Evan: "I wouldn't mind mingling in your atrium"
Mingling in the atrium by d123a February 19, 2011

Atrium swan dive

In law school (or most grad schools), the term for what you feel like doing during finals, diving off the atrium. Almost all law schools have multistory atriums centered in the middle of a high stress environment.

Many law schools have diving programs after finals as a stress reliever. Unfortunately, most atriums lack an adequate diving pool.
Man if I end up studying this same stuff for 16 hours straight I'm gonna do the atrium swan dive.
there's an atrium in GTA: san andreas
atrium by the fresh prince January 21, 2005
Everyone finds him interesting, handsome, intelligent, and fun to be around. A serious guy who knows everything around him. Kind hearted guy who will do anything for a friend once you gain his trust. Very privet and will never say everything about himself.
I meet this guy named Artium, what an interesting person.
Have you ever heard of the name Artium?
You'll never find another guy like Artium
Artium by randonthings December 15, 2019

atrium rat

Kids in high school who hang out in the atrium and are typically looked down on and considered weird. They are usually playing pokémon or watching anime.
Don’t talk to him, i heard he’s an atrium rat!
atrium rat by thatswack19 April 11, 2020
I crazy russian who is likely to rape someone and/ or something when he is older. Also has a hudge mole that probly holds a vidoe camara for russian spys
Cop: Did you rape that kangaroo
Kid: No What do you think I am An Artium?
artium by alex April 23, 2005