A chemical compound or tannin found in geranium plants, particularly in geranium roots, sometimes used in traditional medicine and dyes.
From geranium plus the chemical suffix '-in' indicating an organic compound. This term emerges from phytochemistry literature where researchers identified and named alkaloids and tannins from plant sources.
Geranin is a tannin that gives geraniums some of their bitter taste—and tannins are also what make wine and tea taste the way they do, showing how plants use chemistry to protect themselves!
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