noun
rice polishing ratio
Technical term used in sake brewing and rice milling. Indicates the percentage of the original brown rice grain remaining after polishing. Lower numbers mean more of the outer layers have been removed. Often expressed as a percentage, e.g., 精米歩合60% means 60% of the grain remains.
この日本酒は精米歩合50%の酒米を使っています。
This sake uses rice polished to 50% of its original size.
精米歩合が低いほど、雑味が少なくなり、高級な酒とされます。
The lower the rice polishing ratio, the fewer off-flavors there are, and it is considered a higher-grade sake.
Compound of 精米 (seimai, 'polished rice') and 歩合 (buai, 'rate, ratio').