rice-bran
粐 centers on rice-bran, the outer layer of rice grains removed during polishing.
粐 combines 米 (rice) with 户, which likely contributes the sound ロ or コ. The character is used specifically for rice-bran.
Rice 米 beside a door-like shape 户: imagine rice grains being pushed through a door-like sieve, leaving the bran behind.
For ロ, picture a row of rice grains being polished, and the bran falls off in a low, rolling sound: ro -> ロ.