What's the difference between heteropathy and itself?

Heteropathy

Definition:

• (n.) That mode of treating diseases, by which a morbid condition is removed by inducing an opposite morbid condition to supplant it; allopathy.

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Itself

Definition:

• (pron.) The neuter reciprocal pronoun of It; as, the thing is good in itself; it stands by itself.

Example Sentences: