To heal or cure; to remedy or treat a disease (archaic).
From Latin 'discurare', combining 'dis-' (away, reversal) and 'curare' (to care for, heal). The sense evolved from 'reversing illness' to simply 'curing' or 'healing' the condition.
This word is so archaic that even historical dictionaries rarely list it—it's buried in Middle English medical texts from centuries ago. Modern English completely abandoned it in favor of 'cure,' but medieval physicians would have used 'discure' in their Latin-influenced medical writings.
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