The Collaborative International Dictionary
Histohaematin
Histohaematin \His`to*h[ae]m"a*tin\, n. [Gr. "isto`s tissue + E. h[ae]matin.] (Physiol.) One of a class of respiratory pigments, widely distributed in the animal kingdom, capable of ready oxidation and reduction.
Wiktionary
histohaematin
n. (context biology dated English) One of a class of respiratory pigments, widely distributed in the animal kingdom, capable of ready oxidation and reduction.