Is it farther or further?
1907, from sero-, comb. form of serum, + -ology. Related: Serological; serologist.
serology se·rol·o·gy (sĭ-rŏl'ə-jē)n.
The science that deals with the properties and reactions of serums, especially blood serum.
The characteristics of a disease or an organism shown by study of blood serums.