system
/ˈsi-stəm/
noun
noun
the basic system of antigens of human blood behaving in heredity as an allelic unit to produce any of the ABO blood groups
noun
a part of the vertebrate nervous system that innervates smooth and cardiac muscle and glandular tissues and governs involuntary actions (such as secretion and peristalsis) and that consists of the sympathetic nervous system and the parasympathetic nervous system