brix
n.— «The grapes are picked when their brix (another French word referring to the sugar level in the grapes on the vine) registers at 12 to 14, which is always in the summer but varies in each area of the vineyards.» —“Good ‘n’ Sour Grapes” by Ella Lawrence Metroactive (San Jose, California) Mar. 30, 2005. (source: Double-Tongued Dictionary)