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Zona hemorrhoidalis

zona hemorrhoidalis

zona hemorrhoidalis zona hem·or·rhoi·da·lis (hěm’ə-roi-dā’lĭs)
The part of the anal canal that contains the rectal venous plexus. Also called annulus hemorrhoidalis.


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  • Zona ophthalmica

    zona ophthalmica zona ophthalmica zona oph·thal·mi·ca (ŏf-thāl’mĭ-kə) n. The occurrence of herpes zoster in the region in which the ophthalmic nerve is distributed.

  • Zona pellucida

    the transparent, noncellular layer surrounding the ovum of mammals, often having radial striations. Historical Examples Foulis regards the zona pellucida as a product of the ovum and not of the follicle. The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour zona pellucida zona pel·lu·ci·da (pə-lōō’sĭ-də, pěl-yōō’-) n. The thick solid transparent outer membrane […]

  • Zona reticularis

    zona reticularis zona reticularis zona re·tic·u·lar·is (rĭ-tĭk’yə-lâr’ĭs) n. The inner layer of the cortex of the adrenal gland in which cell cords form a network. Historical Examples Most superficially is the zona glomerulosa, then the zona fascicularis, and most deeply the zona reticularis. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 Various

  • Zona tecta

    zona tecta zona tecta zona tec·ta (těk’tə) n. See arcuate zone.

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