"superlatively sacred or inviolable," c. 1600, from Latin sacrosanctus "protected by religious sanction, consecrated with religious ceremonies," from sacro, ablative of sacrum "religious sanction" (from neuter singular of sacer "sacred") + sanctus, past participle of sancire "make sacred" (for both, see sacred). Earlier in partially Englished form sacro-seint (c. 1500).
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