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Lookups on Merriam-Webster spiked on November 28, 2010.
The American cables revealed by WikiLeaks included the not necessarily diplomatic detail that Libyan leader Mu'ammar al-Gadhafi travels with a "voluptuous blonde" nurse.
Voluptuous means "suggesting sensual pleasure by fullness and beauty of form" in other words, "attractively curvy."
It comes from the Latin word for "pleasure."