RF

noun

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

   noun.substance

   Synonyms releasing factor releasing hormone

   Source: WordNet 3.0

2. a radioactive transuranic element which has been synthesized

   noun.substance

   Synonyms atomic number 104 element 104 rutherfordium unnilquadium unq

   Source: WordNet 3.0

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

   noun.body

   Synonyms reticular formation

   Source: WordNet 3.0