au·ta·coid also au·to·coid 
(ôtə-koid′)
(ôtə-koid′)n.
An organic substance, such as a hormone, produced in one part of an organism and transported by the blood, lymph, or sap to another part of the organism where it exerts a physiologic effect on that part.
[AUT(O)- + Greek akos, cure + -OID.]
au′ta·coidal (-koidl) adj.