What is the name of the Molecular Disruption (M.D.) device sent with the fleet to destroy Lusitania in the novel, Xenocide?

Little Doctor is the name of the Molecular Disruption (M.D.) device sent with the fleet to destroy Lusitania. It was the same weapon used over three thousand years before against the buggers on their home planet. It represents humankind's most terrible capacity for destruction. The threat of the "Little Doctor" being used on both Lusitania and Path is why Jane is forced to reveal herself.