One of the mysteries of the English language finally explained.
Any of various preparations containing antigens of the glanders bacterium, Pseudomonas mallei, used especially in skin testing of horses for the disease. Frequently attributive, especially in "mallein test".
Late 19th century. From scientific Latin malleus glanders + -in, after coinage by C. Helmann, although it is unclear whether the word was used by him in a French or Russian context and in what spelling.
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