noun
amorphous carbon
Technical term in chemistry and materials science for carbon without a crystalline structure.
無定形炭素は、結晶構造を持たない炭素の同素体です。
Amorphous carbon is an allotrope of carbon that lacks a crystalline structure.
Compound of 無定形 (amorphous) + 炭素 (carbon). The exact historical derivation is uncertain; the term is a modern scientific coinage.