|(in chemistry) indicating a group or radical: methyl; carbonyl|
|[from Greek hulē wood, matter]|
|a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.|
|the offspring of a zebra and a donkey.|
A monovalent organic acid radical: carbonyl.
A suffix used to form the chemical names of organic compounds when they are radicals (parts of larger compounds), such as ethyl and phenyl.