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From the words rhino (nose) and lith (rock). A Rhinolith is an enormous hard booger that when removed has a semblance of having a rock pulled from ones nose.
Dude, I can't breathe...

Check your nose for a rhinolith...

Yep, that's what it was alright, look at the size of this thing, I think they used these to build Stonehenge.
by Tannasgh September 03, 2006