noun
Technical term used in computing and materials science to describe a non-crystalline solid state.
非結晶質シリコンは太陽電池に使われる。
Amorphous silicon is used in solar cells.
Compound of 非 (hi-, 'non-') + 結晶 (kesshō, 'crystal') + 質 (shitsu, 'quality' or 'substance'), literally 'non-crystalline substance'. A modern technical term.