Webster’s Revised Unabridged Dictionary · 1913
Idiopathic
Id′i·o·path′ic, Id′i·o·path′ic·al, a. [Cf. F. idiopathique.] (Med.) Pertaining to idiopathy; characterizing a disease arising primarily, and not in consequence of some other disease or injury; — opposed to symptomatic, sympathetic, and traumatic. — Id′i·o·path′ic·al·ly, adv.