Steroid

Definition

Steroids are a class of lipids characterized by a molecular structure containing four fused rings. They function as important components of cell membranes and as signaling molecules in the body.

Related terms

Cholesterol:

A type of steroid that is essential for the structure and function of cell membranes, and serves as a precursor for other steroids.

Hormones:

Chemical substances produced in the body that serve as signaling molecules; some hormones, like testosterone and estrogen, are steroids.

Lipids:

A broad group of naturally occurring molecules which includes fats, waxes, sterols (including steroids), fat-soluble vitamins (such as vitamins A, D, E, and K), monoglycerides, diglycerides, triglycerides, and phospholipids