Harderian gland atrophy atrophic Harderian gland acquired diminution of the size of the sebaceous gland that is located behind the eyeball and excretes fluid that facilitates movement of the nictitating membrane, associated with wasting as from death and reabsorption of cells, diminished cellular proliferation, decreased cellular volume, pressure, ischemia, malnutrition, reduced function or malfunction, or hormonal changes MP:0013445 small Harderian gland Harderian gland atrophy