What is the X in X-mas?
1650s, from Latin degustationem (nominative degustatio) "a tasting," noun of action from past participle stem of degustare "to take a taste from, sample," from de- (see de-) + gustare "to taste" (see gusto).
degustation de·gus·ta·tion (dē'gŭ-stā'shən)n.
The act or function of tasting.
The sense of taste.