• (n.) Mucus, phlegm.
Pit'u·ite noun [ Latin pituita : confer French pituite . Confer Pip a disease of fowls.] Mucus, phlegm. 
pituite Mucus, phlegm. Mucus is the free slime of the mucous membranes, composed of secretion of the glands, along with various inorganic salts, desquamated cells and leucocytes. Phlegm is viscid mucus secreted in abnormal quantity in the respiratory and digestive passages.