Rf
— Noun
– English
~ a radioactive transuranic element which has been synthesized
rf
— Noun
– English
~ a substance produced by the hypothalamus that is capable of accelerating the secretion of a given hormone by the anterior pituitary gland
RF
— Noun
– English
~ 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
RFD
— Noun
– English
~ free government delivery of mail in outlying country areas
rg
— Noun
– English
~ a radioactive transuranic element