Pomace is the ground flesh and pits left after pressing.
According to the International Olive Oil Council, oils in this category are obtained by treating olive pomace with solvents or other physical treatments, to the exclusion of oils obtained by re-esterification processes and of any mixture with oils of other kinds. They are considered an inferior grade and are generally used for soap making or industrial purposes. This category includes crude olive-pomace oil, refined olive-pomace oil, and what is called olive-pomace oil which is a blend of refined olive-pomace oil and virgin olive oil. (Yes, this is confusing!)