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 ,
• unnilquadium ,
• Unq ,
• element_ ,
• atomic_number_ ,

) 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 ;