单词	tunica
释义	tunica /ˈtjuːnɪkə / noun (plural tunicae /ˈtjuːnɪkiː/) 1 Anatomy A membranous sheath enveloping or lining an organ: [with Latin modifier]: tunica media... Arterial calcification most commonly involves the tunica media. Muscle fibers arranged in various striae form the tunica media of veins, for example, in medium-sized vessels. The tumor completely encased the right coronary artery with external compression of the vessel wall without invasion into the tunica media. 2 Botany The outer layer or layers of cells in an apical meristem, which contribute to surface growth. Origin Late 17th century: from Latin, literally 'tunic'.
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