In chemistry, describing a solution that contains one hundredth of a normal concentration of solute.
From Latin 'centum' (hundred) + 'normal,' from Medieval Latin 'normalis' (according to the square, standard). The term was developed in analytical chemistry to describe precisely measured solution strengths using the metric-based normal concentration scale.
Before modern analytical tools, chemists had to make incredibly precise solutions by hand, and naming the strength by fractions (centinormal, decinormal) helped them remember exactly how diluted something was—it's like an ancient safety label!
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