noun. An oxide containing a relatively small amount of oxygen.

noun. An oxide containing a relatively small amount of oxygen, and less than the normal proportion.

noun. any oxide containing a small proportion of oxygen

"His earliest research was in the field of inorganic chemistry, where he was the discoverer of an oxide of carbon having some unusual properties - carbon suboxide."

boron suboxide  carbon suboxide  lead suboxide  macrocyclic carbon suboxide  molybdenum suboxide