† ryghtmathyObs.—1 [ad.med.L. rithmachia, for arithmomachia, ad.Gr. *ἀριθµοµαχία.] The philosophers' game (see philosopher 5 b). c1407Lydg.Reson & Sens. 2414 The play he kan of Ryghtmathye, Which dulle wittis doth encombre, For thys play stant al by novmbre.