The sacrum in the pelvic girdle
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From Latin os sacrum (holy bone), a calque of Ancient Greek ἱερὸν ὀστέον (hieròn ostéon). Apparently so called either because the sacrum was the part of the animal offered in sacrifice or because of a putative belief that it is where a person's soul resides. A third explanation is that the term is a mistranslation of Ancient Greek ἱερὸν (hieròn), which has two meanings: “holy, sacred”, and “big”[1]big being a more appropriate description of the sacrum — but compare.[2]


sacrum (plural sacra or sacrums)

  1. (anatomy) A large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.

Derived termsEdit



  1. ^ Voss, Herrlinger, Taschenbuch der Anatomie
  2. ^ sacrum” in Douglas Harper, Online Etymology Dictionary, 2001–2020.




From sacer (sacred, holy).



sacrum n (genitive sacrī); second declension

  1. A holy or sacred object, e.g. vessel, statue, utensil.
  2. A holy or sacred place, e.g. sanctuary, shrine, temple.
  3. A religious act or observance, e.g. a sacrifice, festival, rite.
  4. Divine worship or religion.
    • c. 54-51 B.C.E., Cicero, De re publica, 2.7.13
      quo foedere et Sabinos in civitatem adscivit sacris conmunicatis et regnum suum cum illorum rege sociavit
      By this compact he admitted the Sabines into the city, gave them a participation in the religious ceremonies, and divided his power with their king.
  5. The private religious rites of a family.
    • c. 51 B.C.E., Cicero, De Legibus, 2.9.22
      sacra privata perpetua manento
      Let private devotions be perpetually practised.
  6. (only in plural) Poems (as sacred to the muse).
    • c. 8-18 AD, Ovid, Tristia, 4.10.19
      at mihi iam puero caelestia sacra placebant inque suum furtim Musa trahebat opus
      But even as a boy the heavenly poems delighted me, and the Muse was drawing me secretly to her work.
  7. (only in plural, post-Augustan) Secrets, mysteries.
    • 8 AD, Ovid, Metamorphoses, 7.709
      sacra tori coitusque novos thalamosque recentes primaque deserti referebam foedera lecti
      I told Aurora of our wedding secrets and all refreshing mysteries of coition – and my first union on my now-deserted couch.


Second-declension noun (neuter).

Case Singular Plural
Nominative sacrum sacra
Genitive sacrī sacrōrum
Dative sacrō sacrīs
Accusative sacrum sacra
Ablative sacrō sacrīs
Vocative sacrum sacra



  1. nominative neuter singular of sacer
  2. accusative masculine singular of sacer
  3. accusative neuter singular of sacer
  4. vocative neuter singular of sacer

Related termsEdit


  • sacrum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • sacrum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • sacrum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
  • sacrum in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • to be present at divine service (of the people): sacris adesse
    • to be initiated into the mysteries of a cult: sacris initiari (Quintil. 12. 10. 14)
    • (ambiguous) ritual; ceremonial: sacra, res divinae, religiones, caerimoniae
    • (ambiguous) to sacrifice: sacra, sacrificium facere (ἱερὰ ῥέζειν), sacrificare
    • (ambiguous) to profane sacred rites: sacra polluere et violare
  • sacrum in William Smith, editor (1854, 1857) A Dictionary of Greek and Roman Geography, volume 1 & 2, London: Walton and Maberly