The term "alexiteric" refers to something that has the power to ward off or prevent infection. There are a few synonyms that can be used in place of this word, including prophylactic, preventative, and immunizing. Each of these terms implies the ability to prevent disease or illness, and may be used interchangeably with alexiteric. Other synonyms for this word might include antiseptic, germicide, or disinfectant, which refer more specifically to the ability to kill or inhibit the growth of bacteria and viruses. Overall, there are many words that can be used to convey the idea of preventing or fighting against infection, each with its own nuances and shades of meaning.