By Malvina Demaj Last Updated: Mar 6, 2026

Must

(muhst)
DEFINITION

Must

Grape must refers to the freshly pressed, unfermented grape juice which contains the fruit’s skins, seeds and sometimes stems (collectively referred to as pomace). It is the first step in winemaking, which serves as the base for fermentation by yeast into alcohol. Its name is derived from the Latin phrase “vinum mustum”, which means “young wine”.

Did you know? In the Catholic Church, must is officially allowed as a substitute for wine if a priest or attendee cannot drink fermented alcohol, provided it is fresh or preserved without heating.

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