In a way that can be discerned or perceived; visibly, noticeably, or distinguishably.
From 'discernable' plus the adverb-forming suffix '-ly', which converts adjectives into adverbs describing manner or degree.
'Discernably' is the rare adverb form—most people would say 'noticeably' instead, but scientists sometimes use 'discernably' to sound more precise about careful observation and distinction.
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