alexo-, alex-, alexi- (Greek: defend, protect, ward off, keep off).alexeteric: 
Protective against infection or poison.
 
alexidine: 
An antibacterial substance.
 
alexin: 
1. A defensive substance in normal serum that destroys bacteria and other cells.  
alexipharmac, 1. Warding off the ill effects of a poison. 2. A name for a class of substances found in blood-serum, having the capacity of destroying bacteria, etc., and thus guarding against infection. 2. An antidote or remedy for poisoning. alexipharmic: 
Antidotal; an antidote.
 
alexipyretic: 
A substance that reduces fever; antipyretic.
 
phytoalexin: 
Any substance that is produced by plant tissues in response to contact with a parasite and specifically inhibits the growth of that parasite. The term was originally defined with regard to fungal parasites only, but in 1956 it was extended to cover all parasites [According to the Oxford English Dictionary].
 
Alexander: 
alexicacon: 
alexikakon: 
alexipharmac: 
alexipharmacal: 
Alexis: 
alexiteric: 
alexitery: 
alexocyte: 
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