outer layer, husk / crust / cuticle

(rare) fruit

edible fruit that grows on trees or shrubs, such as oranges and apples, or sweet edible fruit that grows along the ground, such as strawberries and melons

Solid, hard, firm.

Keeping a material's shape that does not crack or break apart; hard / Keeping one's appearance or facial expression; serious

Tang confectionery

dried fruit (small fruit that have been preserved by drying)

a hard palate

anhydrite

硬い: keeping its physical shape or appearance under a force: stiff / 固い: keeping its shape or behaviour even under other influences: hard, firm