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The Clue
Baseball positions: Abbr. (3 letter answer)
The Answer
RFS
Tags
Notes
The answer RFS is so rare that it appears less than once every 2500 puzzles.
Related Clues
Ruth, Ott et al.: Abbr.
Definition
RF as a noun:
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 104, atomic number 104) = 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