In a manner relating to the measurement or analysis of acetic acid content or acetone levels in a substance.
From acetometry (the measurement of acetic acid) + -ically (making it an adverb), a 19th-century analytical chemistry term.
This is what happens when scientists need to describe *how* something is measured—acetometrically means 'in the way that acetometry is done,' which itself means measuring how much acetic acid or acetone something contains.
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