A colorless crystalline chemical compound found in coal tar that can be modified to create useful dyes and fluorescent materials.
From Latin 'acridus' (sharp, bitter) combined with the chemical suffix '-ine'. The term emerged in 19th-century chemistry when scientists discovered this compound in coal tar and named it for its pungent properties.
Acridine is the grandfather of many modern fluorescent dyes and is still used in research to tag and study DNA under microscopes—scientists literally use it to make genetic code glow!
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