The Collaborative International Dictionary of English v.0.48:

Citrange \Cit"range\, n. [Citrus + orange.]
   A citrous fruit produced by a cross between the sweet orange
   and the trifoliate orange (Citrus trifoliata). It is more
   acid and has a more pronounced aroma than the orange; the
   tree is hardier. There are several varieties.
   [Webster 1913 Suppl.]