Dictionary.net

Diminution or cessation of secretion of one or more hormones from the anterior pituitary gland (including LH; FOLLICLE STIMULATING HORMONE; SOMATOTROPIN; and CORTICOTROPIN). This may result from surgical or radiation ablation, non-secretory PITUITARY NEOPLASMS, metastatic tumors, infarction, PITUITARY APOPLEXY, infiltrative or granulomatous processes, and other conditions.

[Greek] Deficiency of pituitary gland, resulting in a type of infantilism; hypohypophysism.

A condition of diminished activity (internal secretion) of the pituitary body, particularly of the posterior lobe. [Gr.]