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The localised zeitgeist, the culminating "mood" of a room or area based on the amalgamation of the indivdual psyches of it's inhabitants, usually with negative connotations, but not exclusively.
""The psychosphere in the room was thick with dread and loathing."

"It wasn't so much the architecture of Derry that made it unsettling, it was something in the psychosphere."
via giphy
by Mestopheles November 15, 2017
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2
The place you are when your mind has been altered by sleep deprivation or drugs to the point where you philosophize ad nauseum.

I used to use this word when I stayed up with my best friend until 3AM camping. It always seemed like in that tent we would figure out how the whole universe worked.
Wow that was totally deep, I think I have entered the psychosphere!
by Sabrnig March 16, 2010
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