An instrument used to measure the concentration or strength of acetic acid in a solution, especially in vinegar.
From 'aceti-' (relating to acetic acid, from Latin 'acetum') + '-meter' (from Greek 'metron' meaning 'measure'). This is a compound technical term for a measuring device.
An acetimeter is what quality-control labs use to ensure vinegar is actually vinegar—the FDA requires vinegar to be at least 4% acetic acid, and acetimeters make sure you're getting the real thing and not just sour water!
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