id·i·o·type 
(ĭdē-ə-tīp′)
(ĭdē-ə-tīp′)n.
The complete set of idiotopes contained within the variable region of a particular immunoglobulin molecule and making up the molecule's antigen binding site.
id′i·o·typic (-tĭpĭk) adj.
idi·o·ty′py (-tī′pē) n.