Serosanguineous means containing or relating to both blood and the liquid part of blood (serum). It usually refers to fluids collected from or leaving the body. For example, fluid leaving a wound that is serosanguineous is yellowish with small amounts of blood.
Taber's Cyclopedic Medical Dictionary, 23rd ed. F.A. Davis Company; 2017. www.tabers.com/tabersonline/. Accessed January 26, 2017.