noun
ague
AY-gyoo/ˈeɪɡjuː/
A bout of fever with chills and trembling.
In the historical novel, an ague leaves the traveler trembling.

Etymology
Latin “sharp” described an acute fever. Ague acquired the more specific sense of a malarial fever involving episodes of chills and shivering.
In context
chatter with his teeth like one in the cold fit of an ague
More examples
- The doctor in the diary described fever and ague.
- Repeated bouts of ague weakened the expedition's leader.
- She wrapped him in blankets during the ague.
Forms
ague · agues