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c.1600, from Middle French tunique, from Latin tunica (cf. Spanish tunica, Italian tonica, Old English tunece, Old High German tunihha), probably from a Semitic source (cf. Hebrew kuttoneth "coat," Aramaic kittuna).
tunic tu·nic (tōō'nĭk, tyōō'-)
A coat or layer enveloping an organ or a part; tunica.