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 (to͞o′nĭ-kə, tyo͞o′-)
n. pl. tu·ni·cae (-kē′, -sē′)
An enclosing membrane or layer of tissue.

[Latin, tunic; see tunic.]


1. (Anatomy) anatomy tissue forming a layer or covering of an organ or part, such as any of the tissue layers of a blood vessel wall
2. (Botany) botany the outer layer or layers of cells of the meristem at a shoot tip, which produces the epidermis and cells beneath it. Compare corpus4
[C17: from Latin tunica tunic]


(ˈtu nɪk, ˈtyu-)

1. a coat worn as part of a military or other uniform.
2. a gownlike outer garment worn by the ancient Greeks and Romans.
a. a woman's straight, usu. sleeveless upper garment, loose or fitted, extending to the hips or below.
b. Also called tu′nic dress`. any of various dresses styled like this or incorporating this as one element.
4. tunicle.
5. a covering membrane, layer, or integument over an organ or part.
[1600–10; (< French tunique) < Latin tunica]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.tunica - an enveloping or covering membrane or layer of body tissuetunica - an enveloping or covering membrane or layer of body tissue
tissue layer, membrane - a pliable sheet of tissue that covers or lines or connects the organs or cells of animals or plants
albuginea - whitish tunic
References in periodicals archive ?
Objective: Vascular calcification is the consequence of the complex interaction between genetic, environmental, and vascular factors, which ultimately lead to the deposition of calcium in the tunica intima (atherosclerotic calcification) or tunica media (Monckenberg's sclerosis).
Las muestras control, coloreados con hematoxilina-eosina, al ser observadas a traves de microscopia optica mostraron vasos sanguineos con caracteristicas normales, con paredes constituidas por una tunica intima, de epitelio plano simple, tunica intermedia y adventicia.
3A and B) has a smooth flat cellular endothelium which lies on a thin tunica intima which is a delicate fibrolastic loose connective tissue containing myointimal cells.
Melanocytic tumors can be found in any location where melanocytes and blasts are present in body such as skin, eyes, adrenal glands, meninges, endocardium and tunica intima of blood vessels (Brito et al.
Intima-media thickness (IMT), also called intimal medial thickness, is a measurement of the thickness of tunica intima and tunica media, the innermost two layers of the wall of an artery.
The aorta in foetal age 30-49 days displayed well-developed tunics, with very prominent elastic membranes, abundant smooth muscle cells and few layers of elastic fibers in the tunica intima.
Microscopically, histopathology did not reveal malignancy, but tissue necrosis, widespread luminal compression secondary to vascular calcification, hyperplasia of the tunica intima, and inflammatory cell infiltration--consistent with a diagnosis of calcific uremic arteriolopathy.
In present study, the tunica intima of the aorta was thickened and the endothelial cells were rounded at many places showing atrophic characteristics, with infiltrating mononuclear cells.
Histopathologically all coronary aneurysms involve destruction of the tunica media which is thinned, sometimes markedly, sometimes to the point of no longer being identifiable between the tunica intima and tunica adventitia.