Top Definition
Classification that dinosaurs belong to.
"What classification of animals are dinosaurs?"
"Oh i know that.. yep.. um.. thats *clears throat*.. um.. the Plis-tuh-sis-reens."
"What was that?!"
"Pluh.. Plih.. P-l-e-i-o-c-e-t-e-n-e-s-o-u-s. Pleiocetenesous."
by Brad 'Danger' Grose July 10, 2008
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