Definition
Serous describes something resembling or relating to serum, the clear, watery fluid that moistens membranes or is exuded in inflammation. Think of it as a watery bodily fluid. It's often used in medical contexts. 'Serous' can describe membranes that secrete this fluid, or the fluid itself. It's like saying something is 'watery' but specifically in a biological sense. A serous membrane reduces friction between tissues.