ETYM Old Eng. agu, ague, Old Fren. agu, French aigu, sharp, Old Fren. fem. ague, Late Lat. (febris) acuta, a sharp, acute fever, from Latin acutus sharp. Related to Acute.
1. A fit of shivering.
2. Successive stages of chills and fever that is a symptom of malaria; SYN. chills and fever.

A mark (') placed above a vowel to indicate pronunciation