Webster’s Revised Unabridged Dictionary · 1913
Panacea
Pan′a·ce′a (păn′ȧ·sē′ȧ), n. [L., fr. Gr. πανάκεια, fr. πανακής all-healing; πᾶς, πᾶν, all + ἀκεῖσθαι to heal.]
1. A remedy for all diseases; a universal medicine; a cure-all; catholicon; hence, a relief or solace for affliction.
2. (Bot.) The herb allheal.