The Collaborative International Dictionary of English v.0.48:

Tent \Tent\, n. [Sp. tinto, properly, deep-colored, fr. L.
   tinctus, p. p. of tingere to dye. See Tinge, and cf.
   Tint, Tinto.]
   A kind of wine of a deep red color, chiefly from Galicia or
   Malaga in Spain; -- called also tent wine, and tinta.
   [1913 Webster]