A common misspelling of 'prescription', which is a doctor's written order for medication or treatment.
This misspelling confuses the prefix: prescription comes from Latin praescriptionem meaning 'a writing before,' from prae- (before) + scribere (to write). The error likely stems from 'per-' being a more common prefix in English.
This misspelling is so common that it reveals how our brains process language—'per-' appears in many more English words than 'pre-', so our mental autocorrect favors the familiar pattern. It's a perfect example of how frequency bias affects even educated writers' spelling choices.
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