1) Drawer 2) Info drawer-outer 3) One who calls forth 4) One who gets a reaction 1) Evoker 
Elicitors, in biology, are compounds that when introduced into a living organism signal the activation or synthesis of another compound. An example of such a molecule is jasmonic acid, which stimulates the biosynthesis of delta-viniferin in grapevine cell cultures. Another example is chitosan which is used in agriculture as a natural biocontrol ag...
A molecule produced by the host (or pathogen) that induces a response by the pathogen (or host). 
<plant biology> Substance that induces the formation of phytoalexins in higher plants. May be exogenous (often produced by potentially pathogenic microorganisms) or endogenous (possibly cell wall degradation products). ... (18 Nov 1997) ... 
A physical, chemical or biological stimulus that triggers defence responses in plants.Substance that induces the formation of phytoalexins in higher plants. May be exogenous (often produced by potentially pathogenic microorganisms), or endogenous (possibly cell-wall degradation products).