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1610s, from Latin pituitarius "mucous," from pituita "clammy moisture, phlegm, mucus, slime," possibly from PIE root *peie- "to be fat, swell" (see pine (n.)). Taken as the name for the gland because it was believed that it channeled mucus to the nose. As a noun by 1899.
pituitary pi·tu·i·tar·y (pĭ-tōō'ĭ-těr'ē, -tyōō'-)
The pituitary gland.
An extract from the anterior or posterior lobes of the pituitary gland, prepared for therapeutic use.
Of or relating to the pituitary gland.
Of or secreting phlegm or mucus; mucous.