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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