degerminator

from The Century Dictionary.

• noun In milling, a machine consisting essentially of two corrugated disks of iron, one fixed and the other revolving, between which wheat is passed to split the grains and extract the germs.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Milling) A machine for breaking open the kernels of wheat or other grain and removing the germs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun agriculture A device that separates the germ from the husk of a cereal grain.