from
The Collaborative International Dictionary of English v.0.48
Contraindicate \Con"tra*in*"di*cate\, v. t. [imp. & p. p.
{Contraindicated}; p. pr. & vb. n. {Contraindicating}.]
(Med.)
To indicate, as by a symptom, some method of treatment
contrary to that which the general tenor of the case would
seem to require; especially, to indicate that a particular
method of treatment should not be used; as, penicilin is
contraindicated in patients who have shown hypersensitivity.
[1913 Webster +PJC]
Contraindicating symptoms must be observed. --Harvey.
[1913 Webster]