Noun

• S: (n) releasing factor, releasing hormone, RF (a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland)
• S: (n) rutherfordium, Rf, unnilquadium, Unq, element 104, atomic number 104 (a radioactive transuranic element which has been synthesized)
• S: (n) reticular formation, RF (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)