rf

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}]

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

RF
       Radio Frequency (mobile-systems)

from Moby Thesaurus II by Grady Ward, 1.0

34 Moby Thesaurus words for "RF":
      AF, CPS, EHF, HF, Hz, MF, SHF, UHF, VHF, VLF, audio frequency,
      carrier frequency, cycles, extremely high frequency, frequency,
      frequency spectrum, hertz, high frequency, intermediate frequency,
      kilocycles, kilohertz, low frequency, lower frequencies,
      medium frequency, megacycles, megahertz, radio frequency,
      spark frequency, spectrum, superhigh frequency,
      ultrahigh frequency, upper frequencies, very high frequency,
      very low frequency