An undesirable change in the composition of a fat or oil involving intermolecular agglomeration or clumping of the normal units of the fat or oil.
A chemical union of two or more molecules of the same kind for forming a new compound having the same elements in the same proportion but of a higher molecular weight and different physical properties.
The process of changing a simple chemical substance or substances into another compound having the same elements usually in the same proportions but with a higher molecular weight.