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From Latin claustrum ‎(a bolt, bar).


claustrum ‎(plural claustra)

  1. (anatomy) A thin lamina of grey matter in each cerebral hemisphere of the human brain.

Related terms[edit]

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.



Consists of claud- ‎(to close, enclose) +‎ -trum. From Proto-Indo-European *kleh₂u- ‎(key, hook, nail) + *-trom ‎(instrumental suffix), related to Latin clāvis ‎(key), clāvus ‎(nail, peg), claustra ‎(dam, wall, barricade, stronghold). Cognate with Ancient Greek κλείς ‎(kleís, bar, bolt, key), Old High German sliozan ‎(to close, conclude, lock), Old Saxon slūtan ‎(to close, conclude, lock).



claustrum n ‎(genitive claustrī); second declension

  1. (rare, chiefly in the plural) a bar, band, bolt
  2. gate, door, bulwark
  3. enclosure (confined space)
  4. cloister (especially in plural)
  5. (Medieval Latin) portion of monastery closed off to laity


Second declension.

Case Singular Plural
nominative claustrum claustra
genitive claustrī claustrōrum
dative claustrō claustrīs
accusative claustrum claustra
ablative claustrō claustrīs
vocative claustrum claustra

Usage notes[edit]

  • Singular forms are almost never encountered; this noun is usually plural.

Related terms[edit]


See also[edit]


  • claustrum” in Charlton T. Lewis & Charles Short, A Latin Dictionary, Oxford: Clarendon Press, 1879.
  • claustrum” in Félix Gaffiot (1934), Dictionnaire Illustré Latin-Français, Paris: Hachette.
  • Meissner, Carl; Auden, Henry William (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • (ambiguous) to break down the gates: claustra portarum revellere
  • claustrum” in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016