[too-ni-kuh, tyoo-]
noun, plural tunicae [too-ni-see, tyoo-] . Anatomy, Zoology, Botany.
a tunic.

< Neo-Latin, special use of Latin tunica tunic

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tunica (ˈtjuːnɪkə)
1.  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 Compare corpus the outer layer or layers of cells of the meristem at a shoot tip, which produces the epidermis and cells beneath it
[C17: from Latin tunicatunic]

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Medical Dictionary

tunica tu·ni·ca (tōō'nĭ-kə, tyōō'-)
n. pl. tu·ni·cae (-kē', -sē')
An enclosing or enveloping membrane or layer of tissues, as of a blood vessel or other tubular structure.

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