Top Definition
A dinosaur believed to exist by those who don't know the difference between phosphorus, the element, and phosphorusauri, the fictional dinosaurs. A common mistake among blondes at trivia.
The symbol P doesn't stand for phosphorusaurus because that's a dinosaur!
#psaurus #phosphorusaurus #phosphorousaurus #fifteenenemone #antonym: potassiusaurus.
by hubbeg August 09, 2011
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