A meal or powder made from processed hair, historically used as a fertilizer or animal feed supplement.
From Old English 'hær' (hair) + 'mæl' (meal, from Proto-Germanic 'mēliz,' meaning ground grain or powder). Hair can be processed into a powder form.
Hair meal is a real agricultural product that contains nitrogen and was used as fertilizer in the 19th and early 20th centuries—human and animal hair from barbershops and slaughterhouses was collected and processed for farm use.
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