bast
Botanical term for the fibrous material from the inner bark of certain plants, used in textiles and cordage.
Bast has strong fibers and is processed into rope and cloth.
Variant kanji form; 靱 is a simplified or alternative form of 靭.
The term 靭皮 (じんぴ) is a Sino-Japanese compound: 靭 (じん, 'tough, pliable') + 皮 (ひ, 'skin, bark'). It refers to the tough inner bark layer of plants.