The phrase "outer husk" refers to the outermost layer or covering of something, like the skin on a fruit or the outer shell of a seed. It is the protective outer part that can be removed or peeled off. Full definition
Bran is the indigestible outer husk of wheat (as well as other cereal grains) and is one of the best sources of dietary fiber. (healthcommunities.com)
If there are many tight layers on the cobs, peel the first dark green outer husks from the corn, leaving just a few protective inner layers. (styleathome.com)
While the nuts are most popular as food, the brutally tough outer husks are composted for fertiliser, the oil is used as a cooking oil (which is friendly for acne) in cosmetics, soaps, and shampoos and the rest is used in animal feed. (supernaturalacnetreatment.com)