from
The Collaborative International Dictionary of English v.0.48
Haematozoon \H[ae]m`a*to*zo"on\ (-t[-o]*z[=o]"[o^]n), n.; pl.
{H[ae]matozoa} (-[.a]). [NL., fr. Gr. a"i^ma, a"i`matos,
blood + zw^,on animal.] (Zool.)
A parasite inhabiting the blood; esp.:
(a) Certain species of nematodes of the genus {Filaria},
sometimes found in the blood of man, the horse, the dog,
etc.
(b) The trematode, {Bilharzia h[ae]matobia}, which infests
the inhabitants of Egypt and other parts of Africa, often
causing death.
[1913 Webster]