Top Definition
A mythical creature, but has been claimed to be spotted in the heights of the Rocky Mountains, that has 19 tentacles and a jagged face. It also has multiple wings and is extremely deadly.
"Dude, I was vacationing in the Rockies and you can totally see the Grasceplicon in the back of this picture!"

"One man went missing in the Rocky Mountains while on a tour group. There is no other explanation that the Grasceplicon."
by Heelaary May 20, 2010
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