It is all in the gress part..of course the word gress does not exist, so we will have to go with gres.
gres
\Gres\, n. Grass. [Obs.] --Chaucer.
Source: Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
gres
GRES: in Acronym Finder
Source: Acronym Finder, © 1988-2003 Mountain Data Systems
And there you have it..i guess
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