AGUE, an intermittent fever, in whatever stage of its progress or whatever its type. Marsh miasma, or the effluvia arising from stagnant water, or marshy ground, when acted upon by heat, are the most frequent causes of this fever. One peculiarity of this fever is its great susceptibility of a renewal from very slight causes, as from the prevalence of an easterly wind, even without the repetition of the original exciting cause.
Source: Collier's New Encyclopedia 1. (1921) New York: P.F. Collier & Son Company. 75.