What's the difference between alexipyretic and alexiteric?

Alexipyretic

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Definition:

• (a.) Serving to drive off fever; antifebrile.
• (n.) A febrifuge.

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Alexiteric

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Definition:

• (a.) Alt. of Alexiterical
• (n.) A preservative against contagious and infectious diseases, and the effects of poison in general.

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