One of the mysteries of the English language finally explained.
A symptom or sign that is characteristic or premonitory of the onset of a disease (chiefly in plural). Also: a set of such symptoms or signs; the initial, usually non-specific stage of a disease.
Mid 19th century; earliest use found in The Lancet. Alteration of either prodrome or prodromus, perhaps after words in -oma (although the semantic connection is not exact), or perhaps as a supposed Latin equivalent to ancient Greek προδρομή an instance of running forward (although this would not explain either of the plural forms), or perhaps originally a plural in form prodroma after ancient Greek πρόδρομα, neuter plural of πρόδρομος.
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