Meaning: n. 1. a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland 2. a radioactive transuranic element which has been synthesized 3. a complex neural network in the central core of the brainstem; monitors the state of the body and functions in such processes as arousal and sleep and attention and muscle tone.
271.
272.
273.