DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   RF
       n 1: 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]
       2: a radioactive transuranic element which has been synthesized
          [syn: rutherfordium, Rf, unnilquadium, Unq, element
    104, atomic number 104]
       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 [syn: reticular formation, RF]