半はん合ごう成せい繊せん維い

• 合ごう成せい繊せん維い

  合成繊維 (synthetic fiber) is made entirely from synthetic polymers, while 半合成繊維 uses chemically modified natural polymers.

• 天てん然ねん繊せん維い

  天然繊維 (natural fiber) is used directly from plants or animals without chemical modification, unlike 半合成繊維.

Compound of 半 (half, semi-), 合成 (synthesis, synthetic), and 繊維 (fiber). The term is a direct calque of English 'semi-synthetic fiber'.