4. A chill, or state of shaking, as with cold. Ague cake, an enlargement of the spleen produced by ague. Ague drop, a solution of the arsenite of potassa used for ague. Ague fit, a fit of the ague. Ague spell, a spell or charm against ague. Gay. Ague tree, the sassafras, sometimes so called from the use of its root formerly, in cases of ague.