mulet noun2 •A fine, a penalty paid for an offense.Art. 22. In case of inability on the part of the offender to pay such mulet, or any part thereof,—power to the Judge , to commit him or her to prison for such term […] — 1843 •(no longer used) A male mule.Of Mules, Male and Female. Qu. VVHy is it that the Mulets beget not, nor the Mules can conceive? — 1637 formsmulets