tertiary syphilis: the third stage; characterized by involvement of internal organs especially the brain and spinal cord as well as the heart and liver
syphilis: a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta)
lycopodiales: lower vascular plants coextensive with the family Lycopodiaceae; in some classifications includes the Selaginellaceae and Isoetaceae