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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.
2. A name for a class of substances found in blood-serum, having the capacity of destroying bacteria, etc., and thus guarding against infection.
alexipharmac, 1. Warding off the ill effects of a poison.
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: