1812 1 236 The words sanguineous system or blood-system may belong both to the vessels and their contents.
1912 J. S. Huxley ii. 63 Cyclosis..performs the same general functions for the organism as does a blood-system.
2004 (Compact ed.) 2 Feb. 3/5 Many of the fish in the Antarctic have ‘antifreeze’ in their blood systems to prevent ice crystals forming in the sub-zero temperatures.