1. (noun) 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. (noun) rutherfordium, Rf, unnilquadium, Unq, element 104, atomic number 104
a radioactive transuranic element which has been synthesized
3. (noun) 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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Definitions of RF 
