The Collaborative International Dictionary of English v.0.48:

alexiteric \a*lex`i*ter"ic\ ([.a]*l[e^]ks`[i^]*t[e^]r"[i^]k),
alexiterical \a*lex`i*ter"ic*al\
   ([.a]*l[e^]ks`[i^]*t[e^]r"[i^]*kal), a. [Gr. 'alexhth`rios
   fit to keep off or help, fr. 'alexhth`r one who keeps off,
   helper; 'ale`xein to keep off: cf. F. alexit[`e]re.] (Med.)
   Resisting poison; obviating the effects of venom;
   alexipharmic.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

alexiteric \a*lex`i*ter"ic\, n. [Gr. 'alexhth`rion a remedy, an
   amulet: cf. F. alexit[`e]re, LL. alexiterium.] (Med.)
   A preservative against contagious and infectious diseases,
   and the effects of poison in general. --Brande & C.
   [1913 Webster] Alfa