The Collaborative International Dictionary of English v.0.48:

Chlorocruorin \Chlo`ro*cru"o*rin\, n. [Gr. chlwro`s light green
   + E. cruorin.] (Physiol.)
   A green substance, supposed to be the cause of the green
   color of the blood in some species of worms. --Ray Lankester.
   [1913 Webster]