Definition of Fat cell

Fat cell: A cell containing fat. Also called an adipocyte.

A fat cell, or adipocyte, is a connective tissue cell that has differentiated and become specialized in the synthesis (manufacture) and storage of fat.

The fat cell (adipocyte) is important to the body in maintaining proper energy balance, storing calories in the form of lipids, mobilizing energy sources in response to hormonal stimulation, and commanding changes by signal secretions.