Grape must in fermentation shall be the product obtained from the fermentation of grape must which has an actual alcoholic strength of more than 1 % volume but less than three fifths of its total alcoholic strength by volume.
Kääriv viinamarjavirre on viinamarjavirde kääritamise saadus, mille tegelik alkoholisisaldus on üle 1 mahuprotsendi, aga alla kolme viiendiku selle üldalkoholisisaldusest.