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The Terrellian plague was a devastating viral infection, renowned for the excruciating discomfort its victims suffered.

The first symptom of Terrellian plague was a minor headache; shortly after the symptoms became much, much worse. (ENT: "Singularity")

In the anti-time future (c. 2395), experienced by Captain Jean-Luc Picard, the Terrellian plague had spread to Romulus. Only a few medical ships were allowed to enter to treat the victims. (TNG: "All Good Things...")

It was often used in hyperbole or as an exaggerating comparative: "It's heartburn, not the Terrellian plague." (VOY: "Message in a Bottle")

According to the pronunciation guide for "All Good Things...", Terrellian was pronounced as "ter-ELL-ee-'n". [1]
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