Etymology
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pituitary (adj.)

1610s, "secreting or containing mucus," originally in reference to the small glands under the cerebrum, from Latin pituitarius "mucous," from pituita "clammy moisture, phlegm, mucus, slime," a word of unknown etymology. Taken as the name for the gland because it was believed that it channeled mucus to the nose. As a noun by 1899.

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Definitions of pituitary
1
pituitary (n.)
the master gland of the endocrine system; located at the base of the brain;
Synonyms: pituitary gland / pituitary body / hypophysis
2
pituitary (adj.)
of or relating to the pituitary gland;
pituitary hormone
From wordnet.princeton.edu