In a manner relating to or characteristic of butyric acid or its properties.
From butyric (adjective) + -ally adverbial suffix. Follows standard English adverb formation from adjectives.
While 'butyrically' is grammatically correct, it's almost never used in real science—chemists instead say 'butyric acid concentration' or 'butyrate production,' showing how usage shapes language even in technical fields.
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