roˈseolous,a.Path. [-ous.] =prec. 1861Bumstead Ven. Dis. (1879) 747 In some cases,..punctae of a deeper color are seen on the surface of the roseolous patches.1873F. T. Roberts Handbk.Med. 1008 A roseolous rash.1897Allbutt's Syst.Med. II. 564 Roseolous and other eruptions.