Yes, ZYMOLYSIS is a Scrabble word!

Letter values in Scrabble US: Z 10, Y 4, M 3, O 1, L 1, Y 4, S 1, I 1, S 1.

Is it a valid word?

ZYMOLYSIS is a valid word in the official Scrabble dictionary (US) and the UK Scrabble Dictionary, but not in Words with Friends (ENABLE).

a process in which an agent causes an organic substance to break down into simpler substances; especially, the anaerobic breakdown of sugar into alcohol