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1.
Celtic word used to describe, essentially, altered states of consciousness. Usually attained through naturally occuring psychotropic drugs.

Druids would often take psilocybin in ceremony and trip off into the Aethyr.

Similar to Sanskrit word "Loka".
"He's just taken a shitload of mushies - he'll be in the Aethyr for hours"
by la November 02, 2004