Plural of caffeine, referring to multiple instances, types, or sources of the caffeine compound.
Simple plural form of caffeine in English, though in practice the word is usually uncountable (you don't typically say 'caffeines'). Used mainly in technical or pharmaceutical contexts when discussing different samples or sources.
While we usually treat caffeine as uncountable like 'water,' chemists and pharmacists might refer to 'caffeines' when discussing multiple samples, different purities, or caffeine from different sources—showing how the same word changes in different scientific contexts.
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