In the food world, the word "germ" refers to a grain (like wheat) kernel's nucleus or embryo. Wheat germ is one of the more commercially popular types on the market. The nutritiously endowed germ furnishes thiamine, vitamin E, iron and riboflavin.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.