Definition from Wiktionary, the free dictionary
Jump to: navigation, search


Wikipedia has an article on:


Borrowed from Latin claustrum (a bolt, bar).



claustrum (plural claustra)

  1. (neuroanatomy) A thin, irregular sheet of grey matter underneath the inner part of the neocortex on both sides of the brains of mammals; its exact function is not understood, but it is believed to facilitate coordination between senses.
    (Can we find and add a quotation of Gray's Anatomy to this entry?)

Related terms[edit]




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, usually 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
  6. (New Latin, neuroanatomy) claustrum (thin lamina of grey matter in each cerebral hemisphere of the human brain)

Usage notes[edit]

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


Second declension.

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

Related terms[edit]


See also[edit]


  • claustrum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
  • claustrum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
  • du Cange, Charles (1883), “claustrum”, in G. A. Louis Henschel, Pierre Carpentier, Léopold Favre, editors, Glossarium Mediæ et Infimæ Latinitatis (in Latin), Niort: L. Favre
  • claustrum in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français [Illustrated Latin-French Dictionary], Hachette
  • Carl Meissner; Henry William Auden (1894) Latin Phrase-Book[1], London: Macmillan and Co.
    • (ambiguous) to break down the gates: claustra portarum revellere
  • claustrum in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
  • claustrum in Ramminger, Johann (accessed 16 July 2016) Neulateinische Wortliste: Ein Wörterbuch des Lateinischen von Petrarca bis 1700[2], pre-publication website, 2005-2016
  • claustrum in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin