subcarbide
Technical term in chemistry for a compound containing less carbon than a normal carbide. Rare outside specialized contexts.
This substance is classified as a subcarbide.
炭化物 (carbide) is the more general term; 亜炭化物 specifically denotes a subcarbide with a lower carbon-to-metal ratio.
Formed from the prefix 亜, meaning “sub-,” and 炭化物, “carbide.”