panacea

/păn”ə-sē’ə/ |From Ancient Greek πανάκεια (panákeia). From πᾶν (pân, “all”) (equivalent to English pan-) + ἄκος (ákos, “cure”).

n – A remedy believed to cure all disease and prolong life that was originally sought by alchemists; a cure-all. Something that will solve all problems.

“A monorail will be a panacea for our traffic woes.”