Oenology is the science and study of wine and winemaking. Oenology is distinct from viticulture, which is the science of the growing, cultivation, and harvesting of grapes. The English word oenology derives from the Greek word oinos (οἶνος) "wine" and the suffix –logia (-λογία) the "study of". An oenologist is an expert in the science of wine and of the arts and techniques for making wine.

Source: Wikipedia