Etymology
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pertussis (n.)

"whooping cough," 1670s (Sydenham), from Modern Latin pertussis, from per- "thoroughly," or here perhaps with intensive force (see per), + tussis "cough," a word of unknown origin.

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Definitions of pertussis

pertussis (n.)
a disease of the respiratory mucous membrane;
Synonyms: whooping cough
From wordnet.princeton.edu