A rare or obsolete chemical or biological compound name, possibly related to abscission or cutting processes in organisms.
Likely derived from 'abscission' with the chemical suffix '-in' (used for proteins, enzymes, and compounds). This appears to be technical or scientific terminology that's largely fallen out of modern use.
Plant scientists once used incredibly specific chemical names like this—it's a reminder that many scientific terms we invent get abandoned as our understanding becomes more sophisticated!
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