Definitions for "Serum"
The watery portion of certain animal fluids, as blood, milk, etc.
A thin watery fluid, containing more or less albumin, secreted by the serous membranes of the body, such as the pericardium and peritoneum.
The liquid that appears when blood is allowed to separate into its separate parts
A serum is a smoothing product to stop your hair from frizzing, keeping it smooth and straight. You'll be able to find a serum that is specifically designed to your own hair type. You can use a serum on wet hair before styling, or when used in moderation on dry hair to get a smoother look.
a concentrated treatment usually used after cleansing
highly concentrated skin care cream.