Pronunciation: (hī"pu-thal'u-mus), [key]
—pl. -miPronunciation: (-mī"). [key] Anat.
a region of the brain, between the thalamus and the midbrain, that functions as the main control center for the autonomic nervous system by regulating sleep cycles, body temperature, appetite, etc., and that acts as an endocrine gland by producing hormones, including the releasing factors that control the hormonal secretions of the pituitary gland.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.