The Collaborative International Dictionary of English v.0.48:

Citrine \Cit"rine\, a. [F. citrin. See Citron.]
   Like a citron or lemon; of a lemon color; greenish yellow.
   [1913 Webster]

   Citrine ointment (Med.), a yellowish mercurial ointment,
      the unguentum hydrargyri nitratis.
      [1913 Webster]