Crossword Genius

Multiple of one? (4)

Ross

I believe the answer is:

twin

(Other definitions for twin that I've seen before include "indistinguishable from the next?" , "Castor or Pollux?" , "Identical sibling" , "eg Pollux or Remus" , "One of two born together" .)

I've seen this clue in The New York Times.
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