sac·ro·sanct (sāk'rō-sāngkt') adj. Regarded as sacred and inviolable.
[Latin sacrōsānctus, consecrated with religious ceremonies : sacrō, ablative of sacrum, religious rite (from neuter of sacer, sacred; see sacred) + sānctus, past participle of sancīre, to consecrate; see sak- in Indo-European roots.] sac'ro·sanc'ti·ty (-sāngk'tĭ-tē) n.
1601, from L. sacrosanctus "protected by religious sanction," from sacro, abl. of sacrum "religious sanction" (from neut. sing. of sacer "sacred") + sanctus, pp. of sancire "make sacred" (see sacred).