[pi-too-i-ter-ee, -tyoo-]
noun, plural pituitaries.
Pharmacology. the extract obtained from the lobes of the pituitary glands of hogs, sheep, and other domestic animals: the posterior lobe constituent increases blood pressure, contracts stomach muscles, etc., and the anterior lobe constituent regulates growth of the skeleton.
of, pertaining to, or involving the pituitary gland.
noting a physical type of abnormal size with overgrown extremities resulting from excessive pituitary secretion.

1605–15; < Latin pītuītārius pertaining to or secreting phlegm. See pip2, -ary

postpituitary, adjective
prepituitary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pituitary (pɪˈtjuːɪtərɪ, -trɪ)
n , pl -taries
1.  pituitary gland See pituitary extract
2.  of or relating to the pituitary gland
3.  archaic of or relating to phlegm or mucus
[C17: from Late Latin pītuītārius slimy, from pītuīta phlegm]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1615, from L. pituitarius "mucous," from pituita "phlegm, mucus." Taken as the name for the gland because it was believed that it channeled mucus to the nose.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pituitary pi·tu·i·tar·y (pĭ-tōō'ĭ-těr'ē, -tyōō'-)

  1. The pituitary gland.

  2. An extract from the anterior or posterior lobes of the pituitary gland, prepared for therapeutic use.

  1. Of or relating to the pituitary gland.

  2. Of or secreting phlegm or mucus; mucous.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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