One of the mysteries of the English language finally explained.
1Medicine. Of a disease, symptom, etc.: intermediate between acute and chronic; more chronic than acute; (in later use) specifically (of schizophrenia) having a duration which is greater than six months but less than two years.
2Chiefly Pharmacology. Of an experimental study: having a fairly long duration (typically between one and three months).
Mid 19th century; earliest use found in The London Medical Gazette. From sub- + chronic.
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