In lipids unsaturated refers to

In lipids, unsaturated refers to unsaturated fats.

Explanation:

Lipids are series of naturally happening natural compounds that you may know by their regular names: oils and fats. A key trait for this gathering of compounds is that they are not solvent in water.

There is a wide range of sorts of lipids. Instances of common lipids incorporate vegetable oil, butter, cholesterol, phospholipids, waxes, and fat-solvent vitamins. The basic traits for these compounds are that they are basically insoluble in water, yet dissolvable in at least one organic solvent.

the lack of double bonds between adjacent carbon atoms in a fatty acid.