Correct spelling for x-disease

Medical definition of x-disease:

A term applied by James Mackenzie to a train of indefinite symptoms of ill health associated with coldness of the extremities, sensitiveness to cold, absence of reaction after a cold bath, dyspepsia bowel disturbances, etc.; a remission in the symptoms is common, when the patient feels well, but a relapse usually occurs; respiration is slow and the heart's action may be slow or irregular; the nature of the disease is not yet known, whence its appellation x- disease.

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1. To pierce with a narrow pointed instrument, as a knife or dagger. 2. A stab wound. 3. A stab culture. ...