One of the mysteries of the English language finally explained.
1The theory that the balance and condition of the four humours, or (in later use) the body fluids generally, are responsible for states of health and disease; any theory of this nature (now historical).
2Any theory attributing a physiological role to specific chemical substances in the body fluids; (Immunology) the theory that immunity, or a specific immunological phenomenon, is dependent upon the action of antibodies rather than cells.
Late 18th century.
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