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Webster 1913 Edition

Noun.

(Med.)

Something, as a symptom, indicating that the usual mode of treatment is not to be followed.

Burke.

Contraindicating

symptoms must be observed.

Harvey.

Noun.

A symptom that forbids to treat a disorder in the usual way.

contraindicant ‎(plural contraindicants)

(medicine) A contraindication.
(Can we find and add a quotation of Burke to this entry?)