tentorium

Early 19th century: from Latin, literally ‘tent’.

tentorium (plural tentoria or tentoriums)

1. The framework of internal supports (a false endoskeleton) within an arthropod head, formed by ingrowths of the exoskeleton called apophyses.
   • 1906, Milett T. Thompson, Alimentary Canal of the Mosquito: (Anopheles Punctipennis):

     In the female of Culex the tentoria arise in front of the border of the occipital foramen and ascend at an angle of twenty-five degrees with the floor of the head.

2. (anatomy) The tentorium cerebelli, an extension of the dura mater that separates the cerebellum from the inferior portion of the occipital lobes.
   • 1961, Progress in Neurology and Psychiatry, page 345:

     Four dogs with intact tentoriums survived 6 weeks and 8 with sectioned tentoriums survived the same period of time.

• tentorial

tentōrium n (genitive tentōrīi); second declension

1. tent

Second declension.

• tentorium in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• tentorium in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• tentorium in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• tentorium in Gaffiot, Félix (1934) Dictionnaire Illustré Latin-Français, Hachette
• tentorium in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers