バナナの皮[banananokawa] banana peel
一皮[hitokawa] unmasking
化の皮[bakenokawa] masking one's true character
化けの皮をはぐ[bakenokawawohagu] to unmask (someone's true nature)
果皮[kahi] pericarp (ripened ovary wall forming part of a fruit)

外皮[gaihi] investment (in the sense of outer layer)
角皮[kakuhi] cuticle
桜皮[kanba] birch (esp. Japanese white birch)
乾皮[kanpi] dried hides
雁皮紙[ganpishi] traditional Japanese paper made from the fibre of plant species Diplomorpha sikokiana (high quality, glossy)

皮鞣し[kawanameshi] tanning
クロム鞣[kuromunameshi] tanning using chromium compounds (i.e. potassium dichromate, etc.)
鞣す[namesu] to tan (leather, hide, etc.)

鞣革[nameshigawa] leather
藍鞣[ainameshi] indigo-dyed leather