tetraceus

tetraceus [cf. tetra, tetartaeus], (of fever) that has a four-day cycle, quartan. tetraceus i. febris quartana Alph. 184; quartana ‥ vocatur ab Ysaac tetraceus; ‥ et dicitur tetraceus a ‘tetras’ quod est trans et ‘traceus’ transiens triteum per diem unam; vel a ‘tetras’ quod est nigra et ‘traceus’ febris, quia fit nigra Gad. 15. 2.