pituitary
Concise Oxford English Dictionary © 2008 Oxford University Press:
pituitary /pɪˈtjuːɪt(ə)ri/
▶noun (pl. pituitaries) (in full pituitary gland or pituitary body) the major endocrine gland, a pea-sized body attached to the base of the brain that is important in controlling growth and the functioning of the other endocrine glands.
– origin C17: from L. pituitarius ‘secreting phlegm’.
'pituitary' also found in these Oxford entries:

