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The failure of reliance on authority is precisely what has happened, historically, to provoke alternate explanations of the derivation of os sacrum. Variant meanings of words, well-known through the ages, have culminated in Lewis Carroll's dictum from Alice in Wonderland: " 'When I use a word,' Humpty Dumpty said, in rather a scornful tone, 'it means just what I choose it to mean—neither more nor less.' "
Oscar Sugar. How the Sacrum Got Its Name-Reply. JAMA. 1987;258(3):325. doi:10.1001/jama.1987.03400030041021