1. 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).
2. rutherfordium, Rf, kurchatovium, Ku, unnilquadium, Unq, element 104, atomic number 104 -- (a radioactive transuranic element which has been synthesized).
3. 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).
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