a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland

[ Syn: releasing factor , releasing hormone , rf ]

a radioactive transuranic element which has been synthesized

[ Syn: rutherfordium , rf , unnilquadium , unq , element 104 , atomic number 104 ]

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

[ Syn: reticular formation , rf ]