In a manner that is capable of being cured or healed; describing something that can be remedied or treated.
From curable plus -ly forming adverbs. This word follows standard English patterns for converting adjectives into adverbs describing how something is done or occurs.
You rarely hear 'curably' in modern speech—it sounds awkward and formal. But in medical Latin, saying something was 'curabile' was common professional shorthand. English adverbs from medical adjectives often fade as medicine develops simpler terminology.
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