[tes.ton] or tes.toon n [MF, fr. OIt testone, aug. of testa head, fr. LL, skull--more at tester] (1536): any of several old European coins: as a: a shilling of Henry VIII of England decreasing in value to ninepence and then to sixpence in Shakespeare's time b: a French silver coin of the 16th century worth between
10. and 14 1/2 sous