Pituitary/pɪˈtuːəteri/ Definition 1 of 2Pro Tip 1/3Physical Condition Used when discussing health issues related to the pituitary gland. Her fatigue was linked to a pituitary condition. Pro Tip 2/3Medical Diagnostics Common in descriptions of test results and diagnoses from healthcare professionals. The MRI scan showed an enlargement of his pituitary. Pro Tip 3/3Specialized Language Frequently used in specialized or technical medical discourse. This medication influences the pituitary secretion of hormones.