The Collaborative International Dictionary of English v.0.48:

Tang \Tang\ (t[a^]ng), n. [Of Scand. origin; cf. Dan. tang
   seaweed, Sw. t[*a]ng, Icel. [thorn]ang. Cf. Tangle.] (Bot.)
   A coarse blackish seaweed (Fuscus nodosus). --Dr. Prior.
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   Tang sparrow (Zool.), the rock pipit. [Prov. Eng.]
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