from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An enclosing membrane or layer of tissue.

from The Century Dictionary and Cyclopedia

  • n. Same as tunic.
  • n. One of the layers of the choroid coat of the eye.
  • n. Specifically, the membrane lining the bony labyrinth of the ear; the walls of the membranous labyrinth.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an enveloping or covering membrane or layer of body tissue


from The American Heritage® Dictionary of the English Language, 4th Edition

Latin, tunic; see tunic.


  • The mesothelioma tissue surrounding the male internal reproductive organs is called the tunica vaginalis testis.


  • It is thicker than the aqueous, but thinner than the crystalline humour; on its back part is spread the retina, and in the middle of its fore part is a small cavity, in which the whole posterior surface of the crystalline lens lies; this humour is also enclosed in a very fine capsule, called tunica vitrea; this capsule at the edge of the crystalline humour is divided into two membranes, of which the one is continued over the whole anterior surface of the vitreous humour, and lines that cavity into which the back part of the crystalline is received; the other passes over the crystalline humour, and covers all its fore part, by which means these two humours are closely connected together.

    Popular Lectures on Zoonomia Or The Laws of Animal Life, in Health and Disease

  • Toga, tunica, pallium, are words easily translated by gown, coat, and cloak; but we have thereby no more true ideas of the fashion of those habits amongst the Romans, than we have of the faces of the tailors who made them.

    An Essay Concerning Human Understanding

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  • Repeated Applications of the Blade were required to cut through the scrotal sac, the epididymis, and the tunica vaginalis.

    The Terror

  • In Constantinopoli habentur multa mirabilia, ac insuper multæ sanctorum venerandæ relliquæi, ac super omnia, preciosissimi Crux Christi, seu maior pars illius, et tunica inconsutilis, cum spongia et arandine, et vno clauorum, et dimidia parte coronæ spineæ, cuius altera medietas seruatur in Capetla

    The Voyages and Travels of Sir John Mandeville

  • At Costantynoble is the cros of our Lord Jesu Crist, and his cote withouten semes, that is clept tunica inconsutilis, and the spounge, and the reed, of the whiche the Jewes zaven oure Lord eyselle11 and galle, in the cros.

    The Voyages and Travels of Sir John Mandeville

  • Tunc clamare coepit Kadi: sanctus non est ille, quia combustus non est, quia tunica quam portat est de lana terræ Habraæ, et ideò nudus exspolietur, et in ignem proijciatur, et videbitur si comburetur vel non.

    The Journal of Friar Odoric

  • The eye is well opened, with thick and curly lashes, but the tunica conjunctiva is rarely of a pure white; the large teeth are of good shape and colour.

    Two Trips to Gorilla Land and the Cataracts of the Congo


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