fertilizin
noun
fer·til·i·zin
| \ fər-ˈtil-ə-zən
, ˈfert-ᵊl-ˌī-zən
\
, ˈfert-ᵊl-ˌī-zən
\
Medical Definition of fertilizin
: a sperm-agglutinating agent that is produced by an egg and plays a part in the preliminaries of fertilization